Date: 10/25/25 5:36 pm From: Jared Del Rosso <jared.delrosso...> Subject: [cobirds] Trilling E. Screech-Owl - Arapahoe
Just a moment or two ago, from a power line in my backyard, an Eastern Screech-Owl trilled. Unfortunately, the owl flew off when my wife and I went outside to listen. I rarely see them so out in the open. As far as I know, there aren't nesting holes or boxes in adjacent yards.
- Jared Del Rosso Centennial, CO
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Date: 10/23/25 6:23 pm From: Scott Severs <scottesevers...> Subject: [cobirds] Re: Tickets Available –BCAS Presents: The Secret Lives of North American Woodpeckers with Paul Bannick (Nov. 11)
Please note, this will be an in-person only event! No zoom available.
Tickets are going fast.
On Thursday, October 23, 2025 at 1:01:41 PM UTC-6 Matias Comina wrote:
>
> *📅 Event Details*
> Tuesday, November 11, 2025
> 7:15 PM – 8:45 PM
> *Unitarian Universalist Church of Boulder (UUCB)*
> 5001 Pennsylvania Ave, Boulder CO
> 🎟 Tickets $10 · Non-refundable · Limited Seating
> ------------------------------
>
> *🎟 Ticket Information*
> As seating is limited, this will be a *ticketed event.*
>
> Tickets go on sale *October 20, 2025 at 7:00 AM.*
> Tickets are *$10* and *non-refundable.*
>
> Please bring *proof of purchase* (digital or printed) to the program.
>
> *Buy Tickets Here:*
> https://www.eventbrite.com/e/the-secret-lives-of-north-american-woodpeckers-tickets-1839313860269?aff=oddtdtcreator > ------------------------------
>
> *The Secret Lives of North American Woodpeckers *
>
> Woodpeckers are the beating heart of North American forests*.* Their
> rhythmic drumming echoes through the trees, while their excavations create
> homes for owls and countless other species. Acting as keystone species,
> they are vital to the health and balance of wooded habitats across the
> continent.
>
> In this new presentation, Paul Bannick takes us deep into the lives of
> these remarkable birds—from Alaska’s boreal forests and the oak woodlands
> of the Midwest to the desert borderlands of the Southwest and the tropical
> forests of Mexico and Florida.
>
> Through *first-hand field experiences*, *over 200 never-before-published
> photographs*, and *the latest science*, Paul shares an intimate look at
> woodpeckers in every season—courtship, nesting, fledging, and surviving the
> winter months. He also explores the habitats that sustain these species and
> what we can do to protect them.
> ------------------------------
>
> *About Paul Bannick*
> Paul Bannick is an award-winning author and wildlife photographer known
> for his stunning imagery that inspires education and conservation. He is
> the author and photographer of five acclaimed books, including *Owl: A
> Year in the Lives of North American Owls* and *The Owl and the Woodpecker*
> .
>
> His photography has appeared in *The New York Times*, *Audubon*, *Nature’s
> Best Photography*, and major bird guides from *Audubon*, *Peterson*, and *The
> Smithsonian*. He has also appeared on *NBC Nightly News*, *PBS*, and *NPR*,
> and serves as a Director for *Conservation Northwest*.
>
> Explore more of Paul’s work and books at PaulBannick.com.
>
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Date: 10/23/25 12:09 pm From: Matias Comina <matiasdcomina...> Subject: [cobirds] Tickets Available –BCAS Presents: The Secret Lives of North American Woodpeckers with Paul Bannick (Nov. 11)
*📅 Event Details*
Tuesday, November 11, 2025
7:15 PM – 8:45 PM
*Unitarian Universalist Church of Boulder (UUCB)*
5001 Pennsylvania Ave, Boulder CO
🎟 Tickets $10 · Non-refundable · Limited Seating
------------------------------
*🎟 Ticket Information*
As seating is limited, this will be a *ticketed event.*
Tickets go on sale *October 20, 2025 at 7:00 AM.*
Tickets are *$10* and *non-refundable.*
Please bring *proof of purchase* (digital or printed) to the program.
Woodpeckers are the beating heart of North American forests*.* Their
rhythmic drumming echoes through the trees, while their excavations create
homes for owls and countless other species. Acting as keystone species,
they are vital to the health and balance of wooded habitats across the
continent.
In this new presentation, Paul Bannick takes us deep into the lives of
these remarkable birds—from Alaska’s boreal forests and the oak woodlands
of the Midwest to the desert borderlands of the Southwest and the tropical
forests of Mexico and Florida.
Through *first-hand field experiences*, *over 200 never-before-published
photographs*, and *the latest science*, Paul shares an intimate look at
woodpeckers in every season—courtship, nesting, fledging, and surviving the
winter months. He also explores the habitats that sustain these species and
what we can do to protect them.
------------------------------
*About Paul Bannick*
Paul Bannick is an award-winning author and wildlife photographer known for
his stunning imagery that inspires education and conservation. He is the
author and photographer of five acclaimed books, including *Owl: A Year in
the Lives of North American Owls* and *The Owl and the Woodpecker*.
His photography has appeared in *The New York Times*, *Audubon*, *Nature’s
Best Photography*, and major bird guides from *Audubon*, *Peterson*, and *The
Smithsonian*. He has also appeared on *NBC Nightly News*, *PBS*, and *NPR*,
and serves as a Director for *Conservation Northwest*.
Explore more of Paul’s work and books at PaulBannick.com.
--
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---------- Forwarded message ---------
From: David Suddjian <dsuddjian...>
Date: Thu, Oct 9, 2025 at 12:12 PM
Subject: DFO BIRD BOMBS: Autumn ID Challenges, Oct 23 at 7pm
To: Colorado Birds <cobirds...>, David Suddjian <
<dsuddjian...>
David Suddjian
Littleton, CO
[image: Autumn ID Challenges.png]
[image: DFO Logo 90th square.jpeg]
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Date: 10/21/25 11:48 am From: Steven Brown <sbrown37...> Subject: [cobirds] Sandhill Cranes, Colo Spgs, El Paso Co, Tues
Hey COBirders,
Our first crane sighting just now - 75 on their way south over NW Colo Spgs - Mountain Shadows, at 12:35.
So cool to see and hear!
Steve Brown Colo Spgs
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Date: 10/21/25 6:09 am From: John Rawinski <johnrawinski0...> Subject: [cobirds] Re: Curve Billed Thrasher Alamosa
Nice find!
On Tuesday, October 14, 2025 at 9:19:59 AM UTC-6 Luke Pheneger wrote:
> Hi all,
>
> Yesterday Brian Genge and I had a Curve Billed Thrasher at Blanca Wetlands
> in Alamosa County. This individual represented the first record for the
> entirety of the San Luis Valley on Ebird. Much like the Crissal Thrashers,
> this sighting was only a matter of time as we continue to witness the
> northward expansion of desert species into new regions of our state.
>
> The exact location of the bird was here: (37.5703595, -105.6839124)
>
> https://ebird.org/checklist/S279201123 >
>
> This comes on the heals of us coming across a Bushtit in Yuma County on
> September 27th which represented a first eBird record for the entirety of
> North East Colorado. Bushtits have been documented (irrupting?) in large
> numbers in SW Kansas in the past albeit sparsely, however, it will be
> intriguing to see if they infiltrate our eastern plains as they have our
> front range.
>
>
> https://ebird.org/checklist/S275838787 >
>
> On a seperate note, Smith Reservoir was full of shorebirds; however, water
> is being let back into the res currently which might eliminate habitat.
> Blanca Wetlands had respectable shorebird numbers as well
>
>
> https://ebird.org/checklist/S279053803 >
>
>
> Best
>
> Luke Pheneger
>
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Date: 10/20/25 7:37 am From: meredith <meredithmcburney...> Subject: [cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Station 10/16 - 10/19/25
Three days of almost no birds and lots of wind, and then one day that
looked about how we would expect for late fall banding:
Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Date: 10/16/25 2:03 pm From: Jared Del Rosso <jared.delrosso...> Subject: [cobirds] Aphids, Maples, Birds - Denver
This afternoon, while walking from my car to the University of Denver campus, I encountered several maples that seemed as much insect as tree. Aphids everywhere, and several birds -- no rarities that I could find, though -- with them: Yellow-rumped Warblers, a White-throated Sparrows, and Black-capped Chickadees. Downy Woodpeckers and Northern Flickers also visited the trees. I heard White-breasted Nuthatches from nearby, too.
These maples had red-turning leaves, but I'm hesitant to guess at the species or hybrid status of these, landscaping trees as they are.
One wonders if similar aphid outbreaks are happening elsewhere around Denver and if, indeed, there might be a rare warbler among them.
- Jared Del Rosso Centennial, CO
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Date: 10/16/25 11:29 am From: Paula Hansley <plhansley...> Subject: [cobirds] White-throated Sparrow, Louisville
I grew up in SW Ohio hearing the plaintive song of this handsome bird
[image: WthrSpalertJPG.JPG]
Paula Hansley SE Boulder County
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Date: 10/16/25 6:28 am From: Jared Del Rosso <jared.delrosso...> Subject: [cobirds] Re: Hummingbird nests and/or photos?
Thank you to all who sent me photos! I got a ton of emails -- and would
welcome more -- so it'll take me a little while to follow up with everyone!
The range of "designs" on the nests are fascinating -- lichen covered nests
(usually in the mountains, it seems), cottony-covered ones, and the
occasional nest working in human-made materials. Neat stuff!
Now I just need to find some nests myself!
- Jared Del Rosso
Centennial, CO
On Tuesday, October 14, 2025 at 3:25:29 PM UTC-6 Jared Del Rosso wrote:
> Hi there --
>
> As leaves fall from trees, I'm interested in seeing hummingbird nests
> (preferably around Denver or its southern suburbs). I'm also interested in
> seeing photos of CO hummingbird nests (from anywhere in the state), if you
> happen to have them. (If you're willing to share photos or a nest location,
> please email me directly.)
>
> To cure my inevitable winter boredom, I've taken up an interest in mosses
> and lichens. Hummingbirds use these in their nests, so I'd like to see
> this. They use other plants, too, and I'm curious to see if there's anyway
> of telling through photos or first-hand observations what plant seeds are
> being incorporated into nests. I'll probably watch out for nest-building
> activities next year, too.
>
> It goes without saying, but it's still worth saying: I'm not collecting
> nests. I just want to see photos or potentially photograph them myself.
>
> I also may write about this, once I finish writing about Whip-poor-wills.
>
> Thanks!
> - Jared Del Rosso
> Centennial, CO
>
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Date: 10/15/25 5:59 pm From: <dgulb......> <dgulbenkian...> Subject: [cobirds] Northern Harrier at Crown Hill Open Space
A female, hunting. I used to see this every Fall, but it's been quite a few years. Always a female, always hunting and typically staying a few days. David Gulbenkian Jeffco
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Date: 10/15/25 3:59 pm From: meredith <meredithmcburney...> Subject: [cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Station 10-9 - 10/15/25
The number of birds caught continues at record low levels in the middle of
the time period when we should be catching lots of sparrows, especially
White-crowneds and Juncos. (I had expected the seed-eaters to come through
in more normal numbers, but so far that is not happening.......) Here are
the birds and numbers for the past week:
10/10 - 15 new birds (first day in double digits since 9/24):
Hermit Thrush 1
Orange-crowned Warbler 2
Yellow-rumped Warbler, Audubon's 3
Green-tailed Towhee 1
Lincoln's Sparrow 3
Dark-eyed Junco, Oregon 1
White-crowned Sparrow, Gambel's 3
White-crowned Sparrow, Mountain 1
10/11 - 8 new plus 1 return (banded a prior year):
Ruby-crowned Kinglet 2
Orange-crowned Warbler 2
White-crowned Sparrow, Gambel's 3 new, 1 banded last year
Possible White-crowned Sparrow/White-throated Sparrow hybrid 1 (When you
have a ton of time, you see things you might otherwise miss; on the other
hand, you may invent things that don't exist. We are reviewing.....)
10/12 - 5 new birds:
Ruby-crowned Kinglet 1
Lincoln's Sparrow 1
Song Sparrow 1
White-crowned Sparrow, Gambel's 2
10/14 - 16 new birds (another double-digit day!):
Northern House Wren 1 (very late.....and we thought we heard others)
Ruby-crowned Kinglet 3
Orange-crowned Warbler 3
Yellow-rumped Warbler, Audubon's 1
White-crowned Sparrow, Gambel's 8
10/15 - We thought the fog was lifting as we opened this morning, but
instead it just got denser and wetter, so we closed early, after catching
just 2 birds:
Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Date: 10/15/25 8:53 am From: 'Meg Reck' via Colorado Birds <cobirds...> Subject: [cobirds] Summer Tanager returned today 10-15-2025-Arapahoe
The Summer Tanager that came to the water tray yesterday at 9:15 came back today at approx. the same time. I watched for it yesterday to see if it would return but did not see it when I was able to look.
I was surprised by its return today at the same time as yesterday. I managed several better photos than yesterday. I will attach one.
It flew off toward the greenbelt behind my fence.
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Meg Reck Arapahoe
Sent from my iPad
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Date: 10/15/25 8:41 am From: Matias Comina <matiasdcomina...> Subject: [cobirds] Boulder Audubon Presents: Dr. Valerie McKenzie on Microbes and Wildlife in a Rapidly Changing World
*Microbes and Wildlife in a Rapidly Changing World: From Colorado Boreal
Toads to African Grey Parrots*
📅 *Tuesday, October 28, 2025*
🕖 *7:15 PM – 8:45 PM* (Doors open 7:00 PM)
📍 *Unitarian Universalist Church of Boulder*
5001 Pennsylvania Ave, Boulder CO 80303
💻 *Also available via Zoom* (link posted day of program here:
https://www.boulderaudubon.org/all-events/october-2025-program)
*Program Description*
Microbes play a powerful role in the health of wildlife—from beneficial
partners to harmful pathogens. At CU Boulder’s McKenzie Lab, Dr. Valerie
McKenzie and her team study how these microscopic organisms shape animal
lives and ecosystems.
In this talk, Valerie will explore why emerging pathogens are increasing
and how they threaten wildlife worldwide, including Colorado’s amphibians.
She’ll focus on a fungal disease driving global amphibian declines, and
share how her lab’s research on the skin microbiome of Colorado boreal
toads is uncovering bacteria that can naturally protect toads from
infection.
Dr. McKenzie will also introduce a new project using microbes to combat
wildlife trafficking, showcasing how microbiology and conservation
intersect in surprising and hopeful ways.
*About the Speaker*
Dr. Valerie McKenzie is a Professor of Ecology & Evolutionary Biology
(EBIO) at CU Boulder. Her research blends parasitology, disease ecology,
microbial ecology, and wildlife conservation to understand how human
impacts shape the microbes, parasites, and pathogens of wildlife.
Her studies help identify the factors behind disease emergence and inform
efforts to protect vulnerable species. She also teaches parasitology,
conservation biology, and host–microbe interactions, and serves as
Associate Chair of Graduate Studies for EBIO.
Valerie has published over 60 scientific papers and received CU Boulder’s
2024 awards for leadership and graduate mentoring. To learn move visit the
lab website https://mckenzielab.com/
*Event Details*
- In Person: Doors open at 7 PM for socializing; program begins at 7:15
PM. Masks are optional but encouraged (free surgical masks available).
- Online: Zoom room opens at 7:10 PM; program begins at 7:15 PM.
Questions taken via chat.
- Access Info: Zoom link posted on the Boulder Audubon website under
programs by the day of the program.
https://www.boulderaudubon.org/all-events/october-2025-program
Matias Comina, Boulder County
Boulder County Audubon Board Member
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Date: 10/14/25 2:25 pm From: Jared Del Rosso <jared.delrosso...> Subject: [cobirds] Hummingbird nests and/or photos?
Hi there --
As leaves fall from trees, I'm interested in seeing hummingbird nests (preferably around Denver or its southern suburbs). I'm also interested in seeing photos of CO hummingbird nests (from anywhere in the state), if you happen to have them. (If you're willing to share photos or a nest location, please email me directly.)
To cure my inevitable winter boredom, I've taken up an interest in mosses and lichens. Hummingbirds use these in their nests, so I'd like to see this. They use other plants, too, and I'm curious to see if there's anyway of telling through photos or first-hand observations what plant seeds are being incorporated into nests. I'll probably watch out for nest-building activities next year, too.
It goes without saying, but it's still worth saying: I'm not collecting nests. I just want to see photos or potentially photograph them myself.
I also may write about this, once I finish writing about Whip-poor-wills.
Thanks! - Jared Del Rosso Centennial, CO
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Date: 10/14/25 1:42 pm From: David Suddjian <dsuddjian...> Subject: Re: [cobirds] ID Help: American Pipit or Sage Thrasher at Lake Pueblo?
Yes, a Sage Thrasher.
David Suddjian
Littleton, CO
On Tue, Oct 14, 2025 at 2:40 PM Caoimhín Perkins <ksperkins59...>
wrote:
> Hi all,
>
> I was wandering around the canyon trails along Lake Pueblo this weekend
> and saw this robin-sized songbird perched on a bush. The size and
> narrowness of the beak tell me this is not a sparrow, and the closest I can
> find to it is a pipit, but I am not confident in that considering the beak
> has a bit of a downturn as seen in the second photo. Never sang or made any
> calls, either, so non help there. Merlin identified it as a Sage Thrasher
> when I did photo ID with these pictures, but I don't think the colors or
> patterns on the face or belly are correct for that.
> [image: IMG_7285.jpg][image: IMG_7283.jpg]
>
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Date: 10/14/25 1:41 pm From: Caoimhín Perkins <ksperkins59...> Subject: [cobirds] ID Help: American Pipit or Sage Thrasher at Lake Pueblo?
Hi all,
I was wandering around the canyon trails along Lake Pueblo this weekend and saw this robin-sized songbird perched on a bush. The size and narrowness of the beak tell me this is not a sparrow, and the closest I can find to it is a pipit, but I am not confident in that considering the beak has a bit of a downturn as seen in the second photo. Never sang or made any calls, either, so non help there. Merlin identified it as a Sage Thrasher when I did photo ID with these pictures, but I don't think the colors or patterns on the face or belly are correct for that. [image: IMG_7285.jpg][image: IMG_7283.jpg]
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Date: 10/14/25 9:07 am From: 'Meg Reck' via Colorado Birds <cobirds...> Subject: [cobirds] Summer Tanager in Arapahoe County
At 9:15 a.m. a summer Tanager made a brief visit to our water tray in our Aurora backyard. We are no longer seeing it. IF it is still around, it could be in the greenbelt between our yard and the apartments like the Pine Warbler was a year or so ago. There is open access to the greenbelt from Arkansas Ave near Buckley Ave. I managed 2 photos that I will attach here.
Meg Reck
Aurora
Sent from my iPad
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Date: 10/14/25 8:20 am From: Luke Pheneger <phenegerluke...> Subject: [cobirds] Curve Billed Thrasher Alamosa
Hi all,
Yesterday Brian Genge and I had a Curve Billed Thrasher at Blanca Wetlands in Alamosa County. This individual represented the first record for the entirety of the San Luis Valley on Ebird. Much like the Crissal Thrashers, this sighting was only a matter of time as we continue to witness the northward expansion of desert species into new regions of our state.
The exact location of the bird was here: (37.5703595, -105.6839124)
This comes on the heals of us coming across a Bushtit in Yuma County on September 27th which represented a first eBird record for the entirety of North East Colorado. Bushtits have been documented (irrupting?) in large numbers in SW Kansas in the past albeit sparsely, however, it will be intriguing to see if they infiltrate our eastern plains as they have our front range.
On a seperate note, Smith Reservoir was full of shorebirds; however, water is being let back into the res currently which might eliminate habitat. Blanca Wetlands had respectable shorebird numbers as well
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Box Springs Pond: Continuing Common Gallinule, a White-throated Sparrow and a Blue-gray Gnatcatcher.
Ordway Reservoir: Philadelphia Vireo
Lake Henry: Quite a few shorebird species, including Sanderlings and flyover Chestnut-collared Longspurs.
Onley Springs: An adult Broad-winged Hawk
Brandon K Percival
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Date: 10/13/25 3:30 pm From: Luke Pheneger <phenegerluke...> Subject: [cobirds] We quit
We’ve given up our search at Sands Lake for the swift. Going to go check
the fish hatchery. Hopefully it will hang around so someone can confirm its
identity. Even the Barn Swallows it was loosely associating with have left.
Luke Pheneger
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Date: 10/13/25 3:10 pm From: Ted Floyd <tedfloyd73...> Subject: [cobirds] Western Field Ornithologists fundraiser, Oct. 12, 2025: Pictorial recap
Hey, everybody, and Happy Indigenous Peoples' Day.
Western Field Ornithologists (WFO), a partner organization with Colorado
Field Ornithologists (CFO), is in the midst of a fall fundraiser. The WFO
fundraiser, called Wings Across The West, is not unlike CFO's recently
completed Colorado Birding Challenge, although the WFO Big Days can be held
anywhere in the West (duh)—and they're not limited to a single county.
I was a member of the Colorado Team captained by WFO BOD member Isabelle
Busch. We were officially *T**he Colorado Critter Chasers & Birding
Avengers—da Bomb! *We did our (somewhat) Big(ish) Day Fun(d)raiser
yesterday, Sun., Oct. 12, 2025, restricting our efforts to Rocky Mountain
Arsenal National Wildlife Refuge, Adams County. Team members were: Claire
Wayner, Hannah Floyd, Tykee James, Sean Huntley, Archer Silverman, Isaac
Boardman, Christian Nunes, Emmet Nunes, Cassidy Nunes, Isabelle, & Yours
Truly.
Our effort was highly civilized. We came and went as we pleased; we stopped
for libations & comestibles seemingly continuously; the kombucha flowed
freely and chocolate cookies were dispensed with abandon; and we iNatted
*everything*. Our unofficial motto: "If it has protoplasm, we count it."
Here are some pictorial highlights from our fun day at The Arsenal:
[image: Arsenal 01.jpg]
*Duetting great horned owls at the refuge entrance.*
[image: Arsenal 02.jpg]
*The endless line of cars waiting to get into the refuge a bit before
sunrise.*
[image: Arsenal 03.jpg]
*The nocturnal migration crew—Hannah, Isabelle, and me. We heard many
spectrogram-supported white-crowned sparrows flying over before sunrise.
Curious was a rock wren singing while it was still nautical dawn. Go
figure.*
[image: Arsenal 04.jpg]
*Here's our team! Back: Isaac, Claire. Middle: Isabelle, Archer, me, Tykee.
Front: Christian with Emmet & Cassidy. Point-5 virtuosa: Hannah. Not
pictured: Sean, who had bailed for a rarity reported elsewhere + an
assignment due the next morning. We respect that. Ya gotta do what ya gotta
do.*
[image: Arsenal 05.jpg]
*Sunrise at The Arsenal.*
[image: Arsenal 06.jpg]
*The group birding at the always-productive canal crossing in the New
Mexico locusts on the walk out to Big Havana Pond. We found orange-crowned
and yellow-rumped warblers, American bushtits, and a hermit thrush in
there, plus flyover American pipits, pine siskins, and evening grosbeaks.*
[image: Arsenal 07.jpg]
*We watched birds, yes, but, honestly, we spent as much time iNatting
non-avian biota. Here's Isaac photo'ing a lupine blue, Icaricia lupini.*
[image: Arsenal 08.png]
*Emmet photo'ing the larva ("caterpillar") of a sphinx moth, family
Sphingidae.*
[image: Arsenal 09.jpg]
*Hannah and Archer photo'ing a great crested grasshopper, Tropidolophus
formusus. Isabelle watches on.*
[image: Arsenal 10.jpg]
*We saw migrating mountain bluebirds at several junctures. This male was
wrangling the larva of a tiger moth, subfamily Arctiinae. We talked about
Dave Leatherman, yes.*
[image: Arsenal 11.png]
*Pincer! Tykee and Hannah are completely boxed in by law enforcement. It's
all good. The cops weren't after Tykee and Hannah, although the vehicle was
quite stuck for a while. I hasten to add: The officers were courteous and
professional. Total respect and gratitude for our beleaguered federal civil
servants, including those in law enforcement.*
[image: Arsenal 12.png]
*Some birds we saw yesterday at The Arsenal. Clockwise from upper left:
mountain bluebird, Gambel white-crowned sparrow, American white pelicans,
Great blue heron.*
[image: Arsenal 13.png]
*A sampler of insects that we iNatted yesterday at The Arsenal. Clockwise
from upper left: great crested grasshopper, Tropidolophus formosus;
red-femured milkweed borer, Tetraopes femoratus; harlequin bug, Murgantia
histrionica; locust borer, Megacyllene robiniae.*
[image: Arsenal 14.png]
*More insects yesterday at The Arsenal. Clockwise from upper left: lupine
bug, Megalotomus quinquespinosus; yellow-bearded hammertail, Efferia
pogonias; salt marsh moth, Estigmene acrea; desert stink beetle, Eleodes
carbonaria.*
[image: Arsenal 15.jpg]
*We celebrated Hannah's birthday at the end! Belatedly, but hey.*
Here's our bare-bones eBird trip report for the day:
ebird.org/tripreport/422423
And if you'd like to contribute to the WFO fundraiser, go here:
Thanks to all the Chasers/Avengers/Bombers for a fun day afield!
Ted Floyd
Lafayette, Boulder Co.
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Brian and I just had a Chaetura swift flyover at Sands Lake SWA. It looked good for Vauxs but no documentation yet. (38.5438099, -106.0030427)
Luke Pheneger
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Date: 10/13/25 1:26 pm From: 'Hugh Kingery' via Colorado Birds <cobirds...> Subject: [cobirds] The Big Sit!
WE hosted a The Big Sit! group on Saturday with some success.
29 species, including a BT Hummingbird, Osprey, Cooper's & Red-tail. 75 robins. Merlin gave us one Crossbill. 60 birds plus the robins.
10 follks came over to Sit! though they didn't sit much.
Nice day.
Hugh Kingery
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Date: 10/11/25 2:47 pm From: vireo1 via Colorado Birds <cobirds...> Subject: [cobirds] REMINDER! Big Sit! to be held at Chatfield State Park on Sunday, October 12
Hello COBIRDERS!
Looking for something to do TOMORROW (Sunday)? How about some leisure birding at a Big Sit?
What is a "Big Sit" you ask?
Well, a Big Sit is similar to the birding event called a "Big Day", in both events participants try to count as many bird species as possible, the difference is that in a Big Day you travel all over a geographical area whereas during a Big Sit you sit (or stand) in one location (a 17-foot diameter "circle") and count as many species seen or heard as possible in the course of the day. This is a worldwide event and as of this posting there are a number of Big Sit "circles" registered for this year's event!
I will once again host a Denver Field Ornithologists field trip, "The Big Sit!" at Chatfield State Park on Sunday, October 12th. This will be the 19th year (non-consecutive, due to covid) for this fun and frivolous event. It is open to the public and EVERYONE is welcome! It will be held from dawn to dusk. Come when convenient. Come for an hour, half a day, or stay all day. Whatever works for your schedule. This is a great event to bring kids, grandkids and friends that might have an interest in birding. 😊
In addition to a day list, we will perform hourly counts so that every hour there are "new" birds to be added to the hour's count.
"The Big Sit!" at Chatfield will be located at the Heronry Overlook on the east side of the reservoir. A park map is at the entrance stations. Come and help find some birds! NOTE: State Parks Pass required for all cars entering the park.
Bring your own chair or use the bench seating provided by the heronry overlook deck. Bring binoculars, spotting scope (if you have), food, water, treats to share or whatever you need to spend time birding!
If you cannot attend "The Big Sit!" at Chatfield create your own! The
details and rules can be found at:
https://www.thebigsit.org/ <https://urldefense.proofpoint.com/v2/url?<u...>&d=DwMFaQ&c=sdnEM9SRGFuMt5z5w3AhsPNahmNicq64TgF1JwNR0cs&r=QsB7J3eiNi0Bk29oWo4fFRir4zrVBVqHe7kVJ-vw_Wg&m=5_XIPaP1uc-wSnKHtDzxYqKQPbn9at1V4_DaY5f8K4IcXxBwlWABcw2LeAJrDTqu&s=C_v6ZMawkyqn9U2yGE2pbRvurjp_Hux3jMTNcBddHv8&e=> Hope to see you all there!
Joey Kellner
Littleton, Colorado
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) ) // )
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) )
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v
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Date: 10/11/25 11:37 am From: Steven Brown <sbrown37...> Subject: [cobirds] White-throated Sparrow, CSR, El Paso CO. Sat
Hey COBirders,
A very slow morning banding at Clear Spring Ranch today. After netting 30 birds yesterday - only 10 were captured today, and none before 8:30 , a drastic departure from normal, when I have pratically been done with new birds by 7:45 the last few weeks!
Only highlight for the day - a Hatch Year Female White-throated Sparrow (F by the very short wing length, HY by the brown eye, and plumage)
I only get about one of these per year at CSR. But this was my 4th Zonotrichia this week - along with the Golden crowned, and Gambel’s and Mountain White-crowns. Pretty cool!
Oh, well, we’ll see what tomorrow brings in - it was a definite Departure Day today!
Happy Migration,
Steve Brown
Colo Spgs
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Date: 10/11/25 10:04 am From: <2mi......> <2mikef...> Subject: [cobirds] 90th Anniversary Party for Denver Field Ornithologists
Our shared roots, CFO and DFO, go way back. DFO encourages COBird group
members to join the in-person celebration of DFO's 90th Anniversary Party
this Monday evening, October 13, Lowry Conference Center (1061 Akron Way,
Denver, CO 80230).
Here's the agenda: 6:30 to 7:00 p.m. — Birthday cake, sparkling water, book
sale; 7:00 — Our annual DFO volunteer recognition program; and then…
Chris Wood, DFO alumnus and eBird Director, with his talk, “Ninety Years of
Birding, 10 Years Ahead: DFO in the eBird Story.”
mike fernandez
Communications & Outreach
Denver Field Ornithologists
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Date: 10/9/25 2:02 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (10/06/25-10/09/25) – Mesa Co.
This new storm cycle coming in this week may have some good potential for
some migrants. We had our first and only Cassin’s Vireo for the season
today. Our fair share of Gambel’s White-crowned Sparrow came through the
station as well. Some of which had decent fat stored up. Closing out the
season, we captured a hatch year Brown Creeper. This marks only the 2nd
time this species had been captures at this location since 2008. The CAVI
and BRCR brought out season total up to 29 species across 201 captured
birds.
*28 Newly Banded Birds:*
Black-capped Chickadee: 1
Bewick’s Wren: 1
Brown Creeper: 1
Cassin’s Vireo: 1
Gambel’s White-crowned Sparrow: 13
House Finch: 3
House Sparrow: 3
Orange-crowned Warbler: 1
Ruby-crowned Kinglet: 1
Song Sparrow: 2
Spotted Towhee: 1
*6 Recaptured Birds:*
Black-capped Chickadee: 1
Gambel’s White-crowned Sparrow: 2
Song Sparrow: 1
Spotted Towhee: 2
This wraps up our fall migration season here on the west slope. Thank you
to all the volunteers and visitors for making this season go so smoothly!
Have a blessed day!
Mietron Shahbodaghloo
GVAS Bird Bander | Mesa County
Bird Conservancy of the Rockies
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David Suddjian Littleton, CO [image: Autumn ID Challenges.png]
[image: DFO Logo 90th square.jpeg]
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Date: 10/9/25 8:29 am From: 'Linda Andes-Georges' via Colorado Birds <cobirds...> Subject: [cobirds] birds moving through central Boulder County
I'm a bit belated with these tidbits, but we had our first (yard) WC Sparrows and flocks of robins on the 6th, about a week after the T. Solitaires arrived. Like others of you, I missed hearing these last year, and am happy to hear their winter territory song returning.
Thanks for the uplifiting news about Sandhill Crane flights; I'll make sure to be outside today for the next wave.
Linda
Personal landscape: Now known as Boulder County (CO). We nest in shortgrass prairie whose caretakers for centuries were the Núu-ci (Ute) Peoples, and many indigenous peoples who lived, traversed and hunted here; more recently the Inono’ei (Arapaho) and Tsistsistas (Cheyenne), all later subject to the colonial Treaty of Fort Laramie of 1851, oft-violated by my own people.
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Date: 10/8/25 8:23 pm From: 'ronbco' via Colorado Birds <cobirds...> Subject: [cobirds] Chukar id help, Larimer county
I was in Hewlett Gulch at about 6000 elevation. The gulch has a some trees, mix of deciduous and conifers. The hillsides are quite barren and rocky. 2 birds, grouse sized, flushed from a conifer and flew up the steep hillside. I tried to refind them and got a couple short calls that were unfamiliar. eBird sound id said Chukar. I think it was too low elevation and not enough spruce for grouse. The eBird sounds for grouse calls were not what I heard. I never imagined Chukars in the foothills but I see some checklists with them there. Thoughts?
Ron Bolton Berthoud
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Date: 10/8/25 7:30 pm From: Steven Brown <sbrown37...> Subject: [cobirds] Oops - CSR #2
I forgot the GCSP photo - here it is.
SB
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Date: 10/8/25 7:29 pm From: Steven Brown <sbrown37...> Subject: [cobirds] Golden-crowned Sparrow, CSR, El Paso Co., Wed
Hey COBirders,
It has been pretty slow banding at Clear Spring Ranch the last several days, averaging about 15 birds per morning. Today I was expecting much either, as the foggy days didn’t deliver much in migration, and the clear nights have been times for flyovers.
But today saw a departure of almost everything I had been seeing (read - Chipping Sparrows), and the unexpected arrival of several new birds at dawn. Among them several Gambel’s and Mountain White-crowned Sparrows (a usual October regular as they winter here), but with them a hatch-year Golden-crowned Sparrow - my first banded, and only my third in Colorado. Photo below.
Also First-of-Season of Yellow-rumped Warbler (Audubon's - HY F), and Hermit Thrush (HY). A few Orange-crowned Warblers continue to filter in, usually later in the mornings, but not big numbers. Also surprising today - a HY M Wilson’s Warbler, recap that I banded September 21! Still hanging around - but not seen in the time in between.
Not banded - but fun to watch - a long, giant flock of over 300 Canada Geese descended to meet another 100 on the ground in the cut hayfields, and around 700 swirling Red-winged Blackbirds - in the air, in clouds, or blanketing the power lines for 100m! And… no mosquitos finally!
Numbers so far - 2050 birds netted for the season so far, 1150 of them Chipping Sparrows (of which about 450 were banded), 250 Wilson’s Warblers for the season, and yesterday a REAL LATE - AD F Black-headed Grosbeak. I’d only previously caught one outside of August - and that on September 7, so a month later than my previous late record!
I am still missing kinglets, only one so far, not many Orange-crowned Warblers, as mentioned, only two thrushes, one today, and today being the first multiples of White-crowned Sparrows - some Octobers I’ve banded 150.
Every year is different.
Plans are to continue until weather shuts me down, or Halloween, whichever comes first.
Happy Migration
Steve Brown
Colo Spgs
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Date: 10/8/25 6:33 pm From: DAVID A LEATHERMAN <daleatherman...> Subject: [cobirds] Magnolia Warbler food item
I checked an eBird checklist by JoAnne Potter Riggle today that showed a Magnolia Warbler at Gypsum Ponds in Eagle, CO. Interestingly several of her 20 images attached to the checklist show the bird with a captured green and white patterned caterpillar. I am pretty sure this caterpillar is that of a Juniper Hairstreak butterfly (Callophrys gryneus). Very cool. I hope Joann checks COBIRDS. I do not have her email.
Below are images of a Juniper Hairstreak caterpillar by Pat Ciesla of Fort Collins via the BugWood photo archive, and the butterfly, one of our loveliest IMO, taken by me near Stoneham in Weld County.
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Here’s a couple of videos of a Sandhill crane flyover at my home near Standley Lake.
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Sent from my iPhone
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Date: 10/8/25 6:12 pm From: mike <mikepaige...> Subject: [cobirds] Re: Sandhill Cranes and solitiares
Just heard some Sandhill Cranes outside of my office window on CU Boulder
campus at 11am. Couldn't see them from my vantage point though.
Mike
Boulder, CO
On Tuesday, October 7, 2025 at 7:14:01 PM UTC-6 David Suddjian wrote:
> A flock of Sandhill Cranes passed to the south unseen high over Ken Caryl
> this evening at 6:45 pm, as it was getting dark. Always a delight!
>
> My other S bird - Townsend's Solitaire - deserves a mention. They seem to
> be fairly plentiful this fall, in contrast to a very poor showing last fall
> and winter. There have been many at Ken Caryl for a little over a week now,
> and this morning I tallied 48 solitaires while birding at various points in
> the Bailey region of Park County.
>
> David Suddjian
> Littleton, CO
>
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Date: 10/8/25 4:54 pm From: Meredith McBurney <Meredith.McBurney...> Subject: [cobirds] P.S. Sandhill Cranes at Barr Lake
Should have mentioned that there were several hundred Sandhill Cranes at Barr Lake this morning. They settled in the area between the lake and the boardwalk (visible from the banding station) for an hour or so.
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Date: 10/8/25 4:46 pm From: Meredith McBurney <Meredith.McBurney...> Subject: [cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Station 10/3 - 10/8/25
Sadly and shockingly, our number of new birds continues to be in single
digits (it has been almost 2 weeks....) Here are the new captures for the
past 5 days:
10/7 - 7 new birds:
Northern Flicker, Red-shafted 1
Northern Flicker, Yellow-shafted 1
(These 2 Flickers provided a much needed treat. Both adult males, they
were caught together in the same net. We have had several hybrids over the
years, but I think this is the first true Yellow-shafted we have caught.
Great to compare!)
Hammond's Flycatcher 1 (late.....)
Ruby-crowned Kinglet 1
Hermit Thrush 2
Gray Catbird 1
10/8 - 4 new plus 2 returns (banded a prior year):
Lincoln's Sparrow 2
Song Sparrow 1 new, 1 banded last year
White-crowned Sparrow, Gambel's 1 new, 1 banded last year
Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Date: 10/7/25 6:41 pm From: Paul Malinowski <pillarpaul...> Subject: Re: [cobirds] Sandhill Cranes and solitiares
While at Chatfield today a large flock of Sandhill Cranes flew over heading
SE disappearing into the clouds at 4:30. Also saw a flock of about a dozen
Mountain Bluebirds there.
Paul Malinowski
Littleton
On Tue, Oct 7, 2025, 7:13 PM David Suddjian <dsuddjian...> wrote:
> A flock of Sandhill Cranes passed to the south unseen high over Ken Caryl
> this evening at 6:45 pm, as it was getting dark. Always a delight!
>
> My other S bird - Townsend's Solitaire - deserves a mention. They seem to
> be fairly plentiful this fall, in contrast to a very poor showing last fall
> and winter. There have been many at Ken Caryl for a little over a week now,
> and this morning I tallied 48 solitaires while birding at various points in
> the Bailey region of Park County.
>
> David Suddjian
> Littleton, CO
>
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Date: 10/7/25 6:27 pm From: Kirstin C. <kirstinaec...> Subject: [cobirds] Sandhill Crane migration over Arvada, west Jeffco
Hi all, We had two large Sandhill Crane groups fly over our house this evening. I could hear them before seeing them!
Kirstin Chapman Arvada, Jefferson County Sent from my iPad
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Date: 10/7/25 6:14 pm From: David Suddjian <dsuddjian...> Subject: [cobirds] Sandhill Cranes and solitiares
A flock of Sandhill Cranes passed to the south unseen high over Ken Caryl this evening at 6:45 pm, as it was getting dark. Always a delight!
My other S bird - Townsend's Solitaire - deserves a mention. They seem to be fairly plentiful this fall, in contrast to a very poor showing last fall and winter. There have been many at Ken Caryl for a little over a week now, and this morning I tallied 48 solitaires while birding at various points in the Bailey region of Park County.
David Suddjian Littleton, CO
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Date: 10/6/25 12:39 pm From: kevygudguy via Colorado Birds <cobirds...> Subject: [cobirds] Grackle Hordes Plus a Surprise! in west Centennial
Hello Fellow Birders,
The Grackles have descended en masse on the suet & feeders in my little townhouse yard today and they are eating me out of house and home. The surprise was two juvenile Red-winged Blackbirds mixed in amongst them. No adult RWBL's seen... yet. I'm about a 1/4 mile northwest of the intersection of Arapahoe Road and Holly Street.
Keep Smilin',Kevin Sent from my Remington Rand Typewriter via my Rotary Dial Wall Phone
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Date: 10/5/25 2:07 pm From: Kevin Schutz <kschutz...> Subject: [cobirds] Hummingbirds - El Paso County
We spotted 3 juvenile Broadtails hanging around our deck this morning. Our last spotted Rufous' were late September. Our feeders have been down for weeks, but we still have pretty good blooms (Hyssops, Salvias, etc.) available in our pots on our deck.
Kevin El Paso County
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Date: 10/5/25 11:43 am From: 'Deborah Carstensen' via Colorado Birds <cobirds...> Subject: [cobirds] Hummer,Arapahoe county
I just wanted to report that I had a hummer in my garden today. I think by the sounds of the chips that it might have been a broadtail, but my certainty level is at about 20%.🙄
Deb Carstensen, Arapahoe county
Sent from my iPhone
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Date: 10/4/25 1:24 pm From: Patrick O'Driscoll <patodrisk...> Subject: Re: [cobirds] Big Sit! to be held at Chatfield State Park on Sunday, October 12
A big P.S. to Joey's post:
Joey says *Chris Wood*, director and a co-founder of eBird and a Denver
area native, plans to join this year's Big Sit! @ Chatfield SP sometime
that morning. Come out Oct. 12 and bird with our Colorado birding
favorite-son-made-good.
You may also have read on CoBirds that one night later, Chris will be the
featured speaker at Denver Field Ornithologists' 90th birthday celebration.
He's a DFO alumnus, having joined as a seventh grader.
His eBird-related topic will be:
*Ninety Years of Birding, 10 Years Ahead: DFO in the eBird Story*
<https://docs.google.com/forms/d/e/1FAIpQLSd2aMrLH69mjpTQAl0auP5wNa2W1bhkjBOySwHL10kEYPSn-w/viewform> Join us *in person* at the Lowry Conference Center (1061 Akron Way, Denver,
80230) on Monday, *October 13*.
Birthday cake and mingling are at 6:30 p.m. and Chris's program begins at 7
p.m. The evening will also include our annual DFO volunteer recognition.
If you're interested, leave *a courtesy RSVP *
<https://docs.google.com/forms/d/e/1FAIpQLSd2aMrLH69mjpTQAl0auP5wNa2W1bhkjBOySwHL10kEYPSn-w/viewform>so we
can estimate the number of attendees. The program (and cake!) are free.
Patrick O'Driscoll
Denver
On Sat, Oct 4, 2025 at 11:21 AM vireo1 via Colorado Birds <
<cobirds...> wrote:
> Hello COBIRDERS!
>
> Looking for something to Sunday, October 12th? How about some leisure
> birding at a Big Sit?
>
> What is a "Big Sit" you ask?
> Well, a Big Sit is similar to the birding event called a "Big Day", in both
> events participants try to count as many bird species as possible, the
> difference is that in a Big Day you travel all over a geographical area
> whereas during a Big Sit you sit (or stand) in one location (a 17-foot
> diameter "circle") and count as many species seen or heard as possible in
> the course of the day. This is a worldwide event and as of this posting
> there are a number of Big Sit "circles" registered for this year's event!
> I will once again host a Denver Field Ornithologists field trip, "The Big
> Sit!" at Chatfield State Park on Sunday, October 12th. This will be the
> 19th year (non-consecutive, due to covid) for this fun and frivolous event.
> It is open to the public and EVERYONE is welcome! It will be held from
> dawn
> to dusk. Come when convenient. Come for an hour, half a day, or stay all
> day. Whatever works for your schedule.
> In addition to a day list, we will perform hourly counts so that every hour
> there are "new" birds to be added to the hour's count.
> "The Big Sit!" at Chatfield will be located at the Heronry Overlook on the
> east side of the reservoir. A park map is at the entrance stations. Come
> and help find some birds! NOTE: State Parks Pass required for all cars
> entering the park.
> Bring your own chair or use the bench seating provided by the heronry
> overlook deck. Bring binoculars, spotting scope (if you have), food,
> water,
> treats to share or whatever you need to spend time birding!
> If you cannot attend "The Big Sit!" at Chatfield create your own! The
> details and rules can be found at:
> https://www.thebigsit.org/ > <
> https://urldefense.proofpoint.com/v2/url?<u...>&d=D >
> wMFaQ&c=sdnEM9SRGFuMt5z5w3AhsPNahmNicq64TgF1JwNR0cs&r=QsB7J3eiNi0Bk29oWo4fFR
>
> ir4zrVBVqHe7kVJ-vw_Wg&m=5_XIPaP1uc-wSnKHtDzxYqKQPbn9at1V4_DaY5f8K4IcXxBwlWAB
> cw2LeAJrDTqu&s=C_v6ZMawkyqn9U2yGE2pbRvurjp_Hux3jMTNcBddHv8&e=
> <https://urldefense.proofpoint.com/v2/url?<u...>&d=DwMFaQ&c=sdnEM9SRGFuMt5z5w3AhsPNahmNicq64TgF1JwNR0cs&r=QsB7J3eiNi0Bk29oWo4fFRir4zrVBVqHe7kVJ-vw_Wg&m=5_XIPaP1uc-wSnKHtDzxYqKQPbn9at1V4_DaY5f8K4IcXxBwlWABcw2LeAJrDTqu&s=C_v6ZMawkyqn9U2yGE2pbRvurjp_Hux3jMTNcBddHv8&e=>> >
> Hope to see you all there!
> Joey Kellner
> Littleton, Colorado
>
> Y
> (oo)
> ) ) _
> ( ( ( '<
> ) ) // )
> ( ( / ""
> ) )
> ( (
> v
>
>
>
>
>
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Date: 10/4/25 10:22 am From: vireo1 via Colorado Birds <cobirds...> Subject: [cobirds] Big Sit! to be held at Chatfield State Park on Sunday, October 12
Hello COBIRDERS!
Looking for something to Sunday, October 12th? How about some leisure birding at a Big Sit?
What is a "Big Sit" you ask? Well, a Big Sit is similar to the birding event called a "Big Day", in both events participants try to count as many bird species as possible, the difference is that in a Big Day you travel all over a geographical area whereas during a Big Sit you sit (or stand) in one location (a 17-foot diameter "circle") and count as many species seen or heard as possible in the course of the day. This is a worldwide event and as of this posting there are a number of Big Sit "circles" registered for this year's event! I will once again host a Denver Field Ornithologists field trip, "The Big Sit!" at Chatfield State Park on Sunday, October 12th. This will be the 19th year (non-consecutive, due to covid) for this fun and frivolous event. It is open to the public and EVERYONE is welcome! It will be held from dawn to dusk. Come when convenient. Come for an hour, half a day, or stay all day. Whatever works for your schedule. In addition to a day list, we will perform hourly counts so that every hour there are "new" birds to be added to the hour's count. "The Big Sit!" at Chatfield will be located at the Heronry Overlook on the east side of the reservoir. A park map is at the entrance stations. Come and help find some birds! NOTE: State Parks Pass required for all cars entering the park. Bring your own chair or use the bench seating provided by the heronry overlook deck. Bring binoculars, spotting scope (if you have), food, water, treats to share or whatever you need to spend time birding! If you cannot attend "The Big Sit!" at Chatfield create your own! The details and rules can be found at: https://www.thebigsit.org/ <https://urldefense.proofpoint.com/v2/url?<u...>&d=D wMFaQ&c=sdnEM9SRGFuMt5z5w3AhsPNahmNicq64TgF1JwNR0cs&r=QsB7J3eiNi0Bk29oWo4fFR ir4zrVBVqHe7kVJ-vw_Wg&m=5_XIPaP1uc-wSnKHtDzxYqKQPbn9at1V4_DaY5f8K4IcXxBwlWAB cw2LeAJrDTqu&s=C_v6ZMawkyqn9U2yGE2pbRvurjp_Hux3jMTNcBddHv8&e=> Hope to see you all there! Joey Kellner Littleton, Colorado
Y (oo) ) ) _ ( ( ( '< ) ) // ) ( ( / "" ) ) ( ( v
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Date: 10/3/25 1:49 pm From: linda hodges <hikerhodges...> Subject: Re: [cobirds] Speaking of Anniversaries!
Yes, thank you to CFO for initiating Cobirds, and to David Suddjian for his
moderator efforts.
*Linda Hodges*
On Fri, Oct 3, 2025 at 9:47 AM 'William H Kaempfer' via Colorado Birds <
<cobirds...> wrote:
> This month marks David Suddjian's 10th anniversary as Cobirds moderator.
> Congratulations, David, on a job well done.
>
> And while I'm at it, I should note that this year marks Cobirds 30th
> birthday. Cobirds is one of the longest running state-focused email bird
> lists (if not the longest). I know that Nebraska has an active email list,
> but the one in Florida just passed away.
>
> Bill Kaempfer
> Safety Harbor, FL
>
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Date: 10/3/25 11:26 am From: Ted Floyd <tedfloyd73...> Subject: [cobirds] Japanese burrowing crickets have arrived in Colorado (& other musings)
Hey, all.
I was out and about in Lafayette, Boulder Co., yesterday evening, Thurs.,
Oct. 2., and I cellphone-photo'd this *great horned owl,* bathed in the
halo of the waxing gibbous moon, along the path:
[image: Great Horned Owl.png]
There was a Riley's tree cricket, *Oecanthus rileyi*, singing from a little
Russian olive, *Elaeagnus angustifolia*, directly ahead, which reminded me
of something Nathaniel Hawthorn once wrote:
"If moonlight could be heard, it would sound just like that.”
Hawthorn seems to have had in mind the snowy tree cricket, *O. fultoni*,
common in New England and elsewhere, in his paean to cricketsong. I'll have
more in a bit about *Oecanthus* tree crickets, but for now, let's talk
about the Japanese burrowing cricket, *Velarifictorus* *micado*. Back on
Thurs. evening, Sept. 25, 2025, I audio-recorded what appears to be
Colorado's first <https://www.inaturalist.org/observations/318228905>, on
the University of Denver campus, Denver Co. And it wasn't alone; others
were going off in the immediate vicinity. Then, back on this past Wed.
evening, Oct. 1, I heard several in Lafayette, and I audio-recorded one of
those <https://www.inaturalist.org/observations/318222486>, too. And I went
back out last night, Thurs., Oct. 2, with better recording gear, and I got
a cleaner recording <https://www.inaturalist.org/observations/318407805> of
one singing in Lafayette.
The Japanese burrowing crickets have arrived! Yay! Yay? Well, they're
invasive and nonindigenous, so perhaps not. They're the gryllid counterpart
of the Eurasian collared-dove. Can I get a woohoo! Again: Perhaps not. In
any event, I wonder whether these burrowing crickets might soon be one of
the dominant night sounds in the Denver metro region. How soon? How about
within a year or so? I'm reminded of how, several years back, Andrew Floyd
and I found one (*n*=1) ebony jewelwing, *Calopteryx maculata*, in the Coal
Creek drainage, Boulder Co.; the next summer, Mikaela Caldera documented
almost 100 along the creek; and the summer following that, there were
thousands up and down the length of the creek. Will the burrowing crickets
do likewise? You heard it here first...
And how, pray tell, do you distinguish the chirping of the Japanese
burrowing cricket from that of the Riley's tree cricket—or any other
cricket for that matter? Well, that's where the fun begins. In a nutshell,
you can do it with your phone. Now there's not a Merlin-like app for
cricketsong (not yet anyhow), so you have to do a wee bit of analysis on
your own. But I, personally, have found doing so to be a wonderful learning
experience. Each cricket has a chirp rate and a so-called "carrier
frequency" (older term, and not a good one; the cricket people are going
over to "dominant frequency," and I think that's good); combine those two
parameters with the ambient temperature (very important), and, in most
instances, you've got it down to just a handful of species already.
Resolving species-level differences sometimes requires taking a look at
something called the pulse pattern.
Case in point: last night's burrowing cricket. Chirp rate, 220 min.⁻¹;
carrier (dominant) frequency, 2.9 kHz; temperature, 18 °C. And last night's
tree cricket: chirp rate, 84 min.⁻¹; carrier (dominant) frequency, 2.2 kHz;
temperature, 17 °C. And the unique pulse patterns seal the deal: 1-5 for
the burrowing cricket, and a highly distinctive alternation between 2-3-3-3
and 2-3-3-3-3 for the tree cricket.
Here's a spectrographic snippet from last night's burrowing cricket,
indicating the fairly straightforward 1-5 pulse pattern:
[image: Velarifictorus micado.png]
And here's a spectrographic snippet from last night's tree
cricket, indicating the alternation between the 2-3-3-3 and 2-3-3-3-3 pulse
patterns:
[image: Oecanthus rileyi.png]
By the way, you can hear the reverb (and see it in the spectrogram) of the
tree cricket <https://www.inaturalist.org/observations/318407817>. How cool
is that! Anyhow, the spectrograms of the tree cricket and burrowing cricket
are totally different, but a few of us (Scott Severs, you out there?) might
be wondering about something: What about the snowy tree cricket, the one
Hawthorne wrote about? The situation is complex; it's "breaking news," you
might say. Apparently, the snowy tree cricket was rather common in the
Front Range metro region until quite recently. But Riley's tree crickets
have recently invaded from points west and south, and they are perhaps
displacing our snowy tree crickets. Here's a recent range map from the
brilliant Singing Insects of North America (SINA) website
<https://orthsoc.org/sina/>:
[image: rileyi range map.png]
But they're here now, distinguished by their unique pulse pattern, as well
as carrier (dominant) frequencies and chirp rates that differ from those of
the snowy tree cricket. And the thing with the chirp rate is especially
curious. The snowy tree cricket is the fabled "thermometer cricket," whose
chirp rate exhibits near-perfect linear dependence (< ±1 °F) on ambient
temperature. There's even a scientific "law" that governs this. It's called
Dolbear's Law.
Well, it all works great in New England, where Amos Emerson Dolbear and,
for that matter, Nathaniel Hawthorne delighted in the songs of snowy tree
crickets. But it gets messy where snowy and Riley's tree crickets come into
contact. Intriguingly, the Riley's tree crickets in the Front Range metro
region seem to sing at a rate intermediate between the "official" chirp
rates for the two species. We're working on it... If you want to dive deep
into the weeds on this one, check out the Thermometer Crickets Page at SINA
<https://orthsoc.org/sina/588thermometer.htm>. I couldn't make this stuff
up.
By the way, the most famous nighttime chirper of all has to be *Gryllus
pennsylvanicus*, the fall field cricket. I recorded one last night in
Lafayette <https://www.inaturalist.org/observations/318407806>, with these
specs: chirp rate, 88 min.⁻¹; carrier (dominant) frequency, 4.6 kHz;
temperature, 17 °C. This species has a characteristic 1-3 pulse pattern, as
indicated by this spectrographic snippet from last night's audio:
[image: Gryllus pennsylvanicus.png]
I suppose I ought to say a bit more about birding, eh? Well, the
hummingbirds are still putting on a good show at Greenlee Wildlife Preserve
in Lafayette. It seems that most of the hummers still hanging on are
hatch-year males, and what's cool about hatch-year males at this time of
year is that they're beginning to acquire adult plumage. Like this
male *black-chinned
hummingbird* in fading light yesterday afternoon, Thurs., Oct. 2, at the
preserve:
[image: BCHu 01.jpg]
Although this little fella is perched at a feeder, he was spending much of
his time catching flying insects. Quick! To the phones! Where's Leatherman
when ya need 'im? Not sure what insects the hummer was murdering, but it
definitely wasn't this one:
[image: Megatibicen dealbatus.png]
That's *Megatibicen dealbatus*, the plains harvestfly, and I recorded it
yesterday whilst photo'g the hummer
<https://www.inaturalist.org/observations/318407804>. Can you say
multi-tasking or what. Anyhow, *M. dealbatus* is not a cricket, but,
rather, a cicada. Oh, and before we proceed, the specs: chirp rate, 168
min.⁻¹; carrier (dominant) frequency, 5.0 kHz; temperature, 27 °C. (Pulse
pattern, as *per* crickets, does not apply in the case of cicadas.) Anyhow,
like seemingly every other species of organism in the Front Range metro
region, the plains harvestfly is in the process of a range shift. We Floyds
heard these rarely at best when we moved to Lafayette a bit under 20 years
ago, but now they are common on warm afternoons in late summer and early
autumn. They're far too big for hummingbirds (duh), but they're not too big
for Mississippi kites. Which point I raise in connection with the striking
correlation between the northward expansion of that marvelous raptor and
that of the deafeningly loud harvestfly. Yes, the kites eat the
harvestflies, and it is remarkable to watch them hovering, like humongous
hummingbirds, in front of big shade trees in Lamar or even Denver where
they glean harvestflies from the foliage.
Okay, I imagine Suddjian's getting impatient with me by now, so I'm audi.
Catcha next time. Peace, —Floyd out
Ted Floyd
Lafayette, Boulder Co.
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Date: 10/3/25 8:47 am From: 'William H Kaempfer' via Colorado Birds <cobirds...> Subject: [cobirds] Speaking of Anniversaries!
This month marks David Suddjian's 10th anniversary as Cobirds moderator. Congratulations, David, on a job well done.
And while I'm at it, I should note that this year marks Cobirds 30th birthday. Cobirds is one of the longest running state-focused email bird lists (if not the longest). I know that Nebraska has an active email list, but the one in Florida just passed away.
Bill Kaempfer
Safety Harbor, FL
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Date: 10/3/25 4:50 am From: David Suddjian <dsuddjian...> Subject: [cobirds] DFO Presents: Chris Wood Oct 13 - Ninety Years of Birding, 10 Years Ahead: DFO in the eBird Story
Join us *in person* at the Lowry Conference Center (1061 Akron Way, Denver,
80230) on Monday, *October 13*. Our guest speaker is *Chris Wood*: DFO
alumnus and director of eBird. Come at 6:30 pm for DFO's birthday cake
celebrating its 90th anniversary and mingling. Woods' program begins at
7:00 pm. The evening will also include our annual DFO volunteer recognition.
*Ninety Years of Birding, 10 Years Ahead: DFO in the eBird Story*
<https://docs.google.com/forms/d/e/1FAIpQLSd2aMrLH69mjpTQAl0auP5wNa2W1bhkjBOySwHL10kEYPSn-w/viewform> Long before he collaborated in the creation of eBird, the global database
and birding phenomenon, Chris Wood was a self-described bird nerd growing
up in the Denver suburbs. In the late 1980s, seventh-grader Wood joined
Denver Field Ornithologists to go on field trips and expand his
precociously prodigious grasp of the world of Colorado birds.
Today, Wood is director of eBird and a prominent member of the Cornell Lab
of Ornithology team at Cornell University in New York state. He is also
managing director of the lab’s Center for Avian Population Studies.
As the most noteworthy alumnus of DFO in the birding world today, he will
speak at a special in-person monthly evening program meeting to celebrate
our club’s 90th anniversary.
Don’t miss this extraordinary program as we make our return to the
face-to-face fellowship that marked the club’s original gatherings starting
90 years ago.
[image: Chris Wood speaking Oct 13 for DFO.png]
[image: Program Previews - CHRIS WOOD , right, birding with DFO members
during Denver visit in February 2018.jpeg]
Wood, at right, birding with DFO on a DFO outing in Feb. 2018 (the late
great Joe Roller at center . . .)
[image: DFO Logo 90th square.jpeg]
David Suddjian
DFO Communications and Outreach
Littleton, CO
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Date: 10/3/25 4:30 am From: Paula Hansley <plhansley...> Subject: [cobirds] Re: Black-chinned(?) Hummingbird, Louisville
The expert consensus is Broad-tailed Hummingbird.
Thank you!
Paula
On Thu, Oct 2, 2025 at 4:22 PM Paula Hansley <plhansley...> wrote:
> Birders,
> This hummer was at my feeders on October 1:
>
>
> [image: BcH10:1.JPG]
>
>
>
> Paula Hansley
> Boulder County
>
>
>
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Our last hummers left a couple of days ago. We're leaving our feeders out
for a couple of more weeks just in case some stragglers come along.
Ira Sanders
Golden, CO
On Thu, Oct 2, 2025 at 6:18 PM Steve Bouricius <bouricii...>
wrote:
--
Ira Sanders
Golden, CO
"My mind is a raging torrent flooded with rivulets of thought cascading
into a waterfall of creative alternatives."
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The last Broad-tailed at our feeders in Peaceful Valley departed on
Sept. 18. I think that any hummingbird in CO after Oct. 15 would
warrant a careful look.
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Date: 10/2/25 4:09 pm From: meredith <meredithmcburney...> Subject: [cobirds] Bird Conservancy of the Rockies - Barr Lake Banding Station 9/28 - 10/2/25
Our season is so ridiculous that I decided to move to reporting once or
twice a week. (Believe me, if we ever seem to actually be part of a
migration process, I will go back to daily.) Here are the last 4 days:
9/28 - 6 new birds:
House Wren 1
Ruby-crowned Kinglet 1
Hermit Thrush 3
White-crowned Sparrow, Gambel's 1
Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Birders, This hummer was at my feeders on October 1:
[image: BcH10:1.JPG]
Paula Hansley Boulder County
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Date: 10/2/25 2:06 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (10/02/25) – Mesa Co.
With just a couple days left until we see a large weather pattern shift, we
expected today to be a nice window for migration, but we were left with
only one bird. A recapture white-crowned sparrow from Tuesday that gained
only 0.3g. Slowest day thus far.
*0 Newly Banded Birds:*
*1 Recaptured Birds:*
Gambel’s White-crowned Sparrow: 1
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around!
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Date: 10/2/25 12:01 pm From: Chicobander <jshieldcastle...> Subject: [cobirds] Chico Basin Ranch Banding Station- Bird Conservancy of the Rockies-10/2/2025
Last Day of banding for the fall season at Chico. Two new birds banded for the season were the highlights: Red-shafted (Northern) Flicker and Immature Broad-winged Hawk!! No recaptures and otherwise it was very quiet around the Olive Grove. Many thanks again to all the Volunteers who assisted with the project this season. The project could not be operated with your help.
I wish you all a great fall and winter season and I hope to see you in the Spring! Today was the last day to bird/visit the ranch until next year.
Julie Shieldcastle Chico Basin Ranch Bird Bander Bird Conservancy of the Rockies
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Date: 10/1/25 2:23 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (10/01/25) – Mesa Co.
A very slow day with only our likely year-round residents. Lots of
recaptures of birds from previous weeks. They’ve been getting lighter in
weight too.
*4 Newly Banded Birds:*
Bewick’s Wren: 1
Spotted Towhee: 3
*3 Recaptured Birds:*
Bewick’s Wren: 2
Spotted Towhee: 1
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around!
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Date: 10/1/25 12:28 pm From: Chicobander <jshieldcastle...> Subject: [cobirds] Chico Basin Ranch Banding Station-Bird Conservancy of the Rockies-10/1/2025
A nice warm day for the first day of October. Not what I would call migration weather. Birds captured today were not out of the ordinary. Many thanks to the Birders and volunteers who helped with the birding information and assisted with the project this season. One more day of banding at Chico tomorrow for the season. *21 New Banded Birds* Wilson's Warbler-6 Hammond's Flycatcher- 1 Ruby-crowned Kinglet- 1 Lincoln's Sparrow- 4 Song Sparrow- 2 Gambel's White-crowned Sparrow- 1 Hermit Thrush- 3 Gray Catbird- 1 Spotted Towhee- 2
*3 Recaptures* Northern House Wren- 2 Brown Thrasher-1
If wanting to bird the ranch on the last day tomorrow, Please sign up on the Aiken Audubon website. *www.aikenaudubon.com <http://www.aikenaudubon.com>*
Have a good day,
Julie Shieldcastle Chico Basin Ranch Bird Bander Bird Conservancy of the Rockies
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Date: 9/30/25 5:11 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (09/30/25) – Mesa Co.
A little bit more productive today as we continued getting a few more
migrant birds in the net. Some of our White-crowned Sparrows had a decent
amount of fat, including a recapture from last week that put on 3 grams or
so. Today we had our first Lincoln’s Sparrow show up at the station. The
morning felt very active with all the WCSP song, but many of them knew to
stay away.
*8 Newly Banded Birds:*
Gambel’s White-crowned Sparrow: 2
House Finch: 1
Lincoln’s Sparrow: 1
Song Sparrow: 1
Spotted Towhee: 2
Wilson’s Warbler: 1
*1 Recaptured Birds:*
Gambel’s White-crowned Sparrow: 1
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around!
GVAS Bird Bander | Mesa County
Bird Conservancy of the Rockies
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Date: 9/30/25 11:55 am From: Chicobander <jshieldcastle...> Subject: [cobirds] Chico Basin Ranch Banding Station- Bird Conservancy of the Rockies-9/30/2025
For the last day of September it sure does not feel like it. A fairly quiet day birdwise in the Olive grove. *22 New Banded Birds* Wilson's Warbler- 4 Ruby-crowned Kinglet- 1 Chipping Sparrow- 1 Lincoln's Sparrow- 3 Song Sparrow- 3 Gambel's White-crowned Sparrow- 3 Hermit Thrush- 1 Gray Catbird- 1 Spotted Towhee- 2 American Robin- 2 Blue Jay- 1
No Recaptures
The banding station will be open tomorrow @sunrise until noonish. Please sign up on the Aiken Audubon Website to visit the Ranch. *www.aikenaudubon.com <http://www.aikenaudubon.com>* Stop by the banding station to share you sightings.
Have a good day,
Julie Shieldcastle Chico Basin Ranch Bander Bird Conservancy of the Rockies
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Date: 9/29/25 4:41 pm From: <dgulb......> <dgulbenkian...> Subject: [cobirds] The Blue Jay Green Jay hybrid
The interesting story is on the CNN website today, 9/29
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Date: 9/29/25 3:34 pm From: Colin Woolley <colin.woolley...> Subject: [cobirds] Bird Conservancy of the Rockies - Chatfield Banding Station Fall week 3 of 3
We wrapped up our 3-week fall season at the Chatfield banding station last week, though we were rained out on Tues so just banded on Thurs and Sat. Too bad, because when out at the site on Tues morning getting rained on, it was quite birdy with mixed sparrow flocks and Yellow-rumped Warblers. The other two days were quite slow, consistent with the slow season we've been having at Barr Lake and our other Front Range sites. We banded just 16 birds combined on Thurs and Sat, of 6 species:
Black-capped Chickadee - 1 Song Sparrow - 1 Brewer's Sparrow - 1 Intermediate White-crowned Sparrow - 1 (this one had very a slight dark supraloral line like a 'Mountain' but the bill color was more yellowish a la 'Gambel's') Spotted Towhee - 7 Orange-crowned Warbler - 5
Thus concludes our pilot fall banding season at Chatfield, in partnership with Denver Audubon. Thanks to all the folks that were able to come out to visit and to our volunteers for helping get this station up and running this Fall. We'll be back here for our Spring season in late April.
Colin Woolley Bird Conservancy of the Rockies
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Date: 9/29/25 2:07 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (09/29/25) – Mesa Co.
Although slower, it seems like our larger storms last night prevented some
of our migrants from going further and stopping by the station today. We
had our first Hermit Thrush with a good amount of fat and a MacGillivray’s
which we had not seen in over a week. Hopefully this high-pressure system
brings some more migrant birds in.
*7 Newly Banded Birds:*
Gambel’s White-crowned Sparrow: 3
Hermit Thrush: 1
MacGillivray’s Warbler: 1
Wilson’s Warbler: 1
Woodhouse’s Scrub-Jay: 1
*1 Recaptured Birds:*
Spotted Towhee: 1
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around!
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Date: 9/29/25 12:46 pm From: Chicobander <jshieldcastle...> Subject: [cobirds] Chico Basin Ranch Banding Station-Bird Conservancy of the Rockies-9/29/2025
A light northwest wind moved out most birds from Saturday's banding day. A nice group of birds showed up including 15 species and a new species for the season- Oregon Junco. While we were closing nets, Sandhill Cranes were heard flying over the ranch. After today it is a tie with 3 Sharp-shinned Hawks and 3 Townsend's Solitaire banded for the season. *36 New Banded Birds* Wilson's Warbler- 8 Orange-crowned Warbler - 3 Northern House Wren- 3 Chipping Sparrow- 3 Oregon Junco- 1 Lincoln's Sparrow- 4 Gambel's White-crowned Sparrow- 3 Song Sparrow- 1 Blue Grosbeak- 1 Townsend's Solitaire- 1 Hermit Thrush- 1 Gray Catbird- 2 Cassin's Vireo- 1 Brown Thrasher- 1 Blue Jay -2
*2 Recaptures* Wilson's Warbler Gray Catbird
This is the last week of fall banding. We will be operating through Thursday from Sunrise to around noon. If wanting to bird or visit the Ranch this week, be sure to sign up on the Aiken Audubon website. *www.aikenaudubon.com <http://www.aikenaudubon.com>*
Enjoy the day,
Julie Shieldcastle Chico Basin Ranch Bird Bander Bird Conservancy of the Rockies
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Observation start time: 08:45:00
Observation end time: 11:15:00
Total observation time: 2.5 hours
Official Counter: Ajit Antony
Observers:
Visitors:
A Chinese woman hiker came up and asked what I was looking for, and I
discussed raptor migration and she asked me a number of questions, Her
companion, an older white gentleman then came up, and he seemed to want to
impress me with his knowledge of raptors. He said some decades ago he was
up here and the paid counter whose salary he mentioned too, told him that
he had seen 27,000 raptors in one day! I told him that there is no such
record at this site in Hawkcount, and the maximum seen in a whole season
would be around 6500, He then dropped his number to 2700 a day. He then
claimed that hawks were not tasty to eat. I told him that he should be
careful, or he could get arrested under the Migration Bird Treaty! Amusing.
Weather:
The forecast for the winds aloft was 29 km/hr from the south, and so it was
the watch, temperature 17 - 20 C, low humidity 25-33%, cloud cover minimal
initially only to the south and by noon MDT there was a bank of cumulus
clouds to the west, visibility 24 km.
With the south winds, no cloud cover with increasing thermalic cumulus
clouds (my neologism, the -ic suffix indicating 'pertaining to') from the
west, and a good soaring forecast with lift of 3.9 m/sec, and maximum
height of thermals 8989 feet above ground level, I knew it was in for a
tough time finding migrants, though I hoped to see a few raptors before
they got too high to be seen even with binoculars.
Raptor Observations:
Exploratory fall count 2025.
See: https://groups.google.com/g/cobirds/c/Oznn4uc6MBk There were only 2 adults RT I found migrating today at 10:28 AM, they acted
like non-migrants, dropping below the ridge top, then I saw them over Mount
Morrison to the SW, and they took off to the SSE.
Non migrant raptors: RT 2, TV 3.
Non-raptor Observations:
Blue Jay 3, American Robin 3, Northern Flicker 10, Common Raven 3, House
Finch 2.
3 paragliders.
Predictions:
The winds aloft are expected to be from the WSW at 14 km/hr. The surface
forecast is for light winds from the west, gradually changing over to NE
with gusts to 18 mph by 2:00 PM, but with better cloud cover 40% at 9:00
AM, and increasing.
========================================================================
Report submitted by Official Counter of the day shown above (<dinoridgehw...>)
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
www.dinosaurridgehawkwatch.org
Site Description:
Dinosaur Ridge is the only regularly staffed hawk watch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Hawk
watchers may see 17 species of migrating raptors; and it is an excellent
site to see rare dark morph buteos including Broad-winged hawk,
Swainson’s hawk, Ferruginous hawk, Rough-legged hawk and Red-tailed Hawk.
Other raptors we see include Golden and Bald Eagles, Northern harrier,
Osprey, Peregrine Falcons, Prairie Falcons, Cooper's and Sharp-shinned
Hawks, American Kestrels, Merlin, and Turkey Vultures. American Goshawk is
uncommon but also counted each season. Non-raptor species include Rock
Wren, Bushtit, Western Bluebird, Sandhill Crane, White-throated Swift,
American White Pelican, and Dusky Grouse. Birders of any skill level are
always welcome. The hawk watch at Dinosaur Ridge is staffed by Hawk
Counter(s) and volunteers from March through early May.
Directions to site:
From exit 259 on I-70 towards Morrison, drive south under freeway and take
left into first parking lot, the Stegosaurus lot. Follow hawk watch signs
from the southwest end of the parking lot to the hawk watch site. The hike
starts heading east on an old two-track and quickly turns south onto a
trail on the west side of the ridge. When the trail nears the top of the
ridge, turn left, and walk to the flat area at the crest of the ridge.
(Distance: 0.56 miles, Elevation gain: 259 feet)
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My deep appreciation to our many wonderful visitors today - we had plenty
of time in between birds, and we spent it engaged in stimulating
discussions about the why of low numbers this season - especially low at
Barr but overall on the front range - as well as what we must do to help
conserve these birds that we all care about so deeply.
Share your passion!
Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Date: 9/27/25 1:26 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (09/27/25) – Mesa Co.
Perhaps our slowest day so far day. Hopefully the storms this weekend will
be bringing some more migrants our way.
*5 Newly Banded Birds:*
Gambel’s White-crowned Sparrow: 1
House Finch: 1
Spotted Towhee: 1
Wilson’s Warbler: 1
Woodhouse’s Scrub-Jay: 1
*0 Recaptured Birds:*
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around!
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With the presence of no recaptures and a few more species, it appears that some birds landed in the olive grove around the banding station this morning. A new species for the season-Black-throated Blue Warbler male made an appearance. Eleven bird species were banded including four species of sparrows. *34 New Banded Birds* Wilson's Warbler- 5 Orange-crowned Warbler- 3 Black-throated Blue Warbler- 1 Chipping Sparrow- 2 Lincoln's Sparrow- 4 Song Sparrow- 1 Gambel's White-crowned Sparrow-3 Hermit Thrush- 8 Gray Catbird- 5 Blue Jay- 1 Brown Thrasher- 1
*No Recaptures*
The banding station will be closed tomorrow and reopen Monday @sunrise. Birding is still open on the ranch tomorrow when you sign up on the Aiken Audubon website. *www.aikenaudubon.com <http://www.aikenaudubon.com>*
Have a good weekend,
Julie Shieldcastle Chico Basin Ranch Bird Bander Bird Conservancy of the Rockies
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Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Observation start time: 08:30:00
Observation end time: 12:00:00
Total observation time: 3.5 hours
Official Counter: Ajit Antony
Observers: Liza Antony
Visitors:
Zak Hepler texted me yesterday wanting to come to the watch, presumably to
find BW. The raptors were so very high today, I texted him not to come
today, but rather to wait until the spring watch when migrant raptors are
more frequent and lower.
Weather:
Winds were light from the NW, temperature 19 to 23° C, low humidity 20%,
cloud cover 70% to 65% high cirrus, clear visibility to 24 km.
Raptor Observations:
Exploratory fall count 2025.
See:https://groups.google.com/g/cobirds/c/Oznn4uc6MBk
The first migrant was an RT to the West at 10:37 a.m. MDT. At 11:24 a.m.
Liza remarked on a pretty cloud overhead and to the SW, and she found two
migrants that I didn't see. Thereafter I looked in that channel, helped by
high cirrus clouds, and was able to find 5 more migrants which were
completely at the limit of binocular ID, though after 12:15 pm the only
migrant I was able to find was a high overhead GE at 12:38 p.m., presumably
because of its large size and dark coloration.
At 11:28 a.m. and 12:15 p.m. I had 2 dark morph juvenile RT - both with
translucent square window panels, the first having a light red tail
indicating it was changing to adult plumage.
Non-migrant Raptors: CH 1, RT 1 TV 2.
Non-raptor Observations:
Black-capped and Mountain Chickadee, Steller's Jay 1, Say's Phoebe 1, Barn
Swallow 2, Northern Flicker 1.
Predictions:
The winds aloft are predicted to come from the NW at 8 km/h, similar to
today.
========================================================================
Report submitted by Official Counter of the day shown above (<dinoridgehw...>)
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
www.dinosaurridgehawkwatch.org
Site Description:
Dinosaur Ridge is the only regularly staffed hawk watch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Hawk
watchers may see 17 species of migrating raptors; and it is an excellent
site to see rare dark morph buteos including Broad-winged hawk,
Swainson’s hawk, Ferruginous hawk, Rough-legged hawk and Red-tailed Hawk.
Other raptors we see include Golden and Bald Eagles, Northern harrier,
Osprey, Peregrine Falcons, Prairie Falcons, Cooper's and Sharp-shinned
Hawks, American Kestrels, Merlin, and Turkey Vultures. American Goshawk is
uncommon but also counted each season. Non-raptor species include Rock
Wren, Bushtit, Western Bluebird, Sandhill Crane, White-throated Swift,
American White Pelican, and Dusky Grouse. Birders of any skill level are
always welcome. The hawk watch at Dinosaur Ridge is staffed by Hawk
Counter(s) and volunteers from March through early May.
Directions to site:
From exit 259 on I-70 towards Morrison, drive south under freeway and take
left into first parking lot, the Stegosaurus lot. Follow hawk watch signs
from the southwest end of the parking lot to the hawk watch site. The hike
starts heading east on an old two-track and quickly turns south onto a
trail on the west side of the ridge. When the trail nears the top of the
ridge, turn left, and walk to the flat area at the crest of the ridge.
(Distance: 0.56 miles, Elevation gain: 259 feet)
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Observation start time: 08:30:00
Observation end time: 12:00:00
Total observation time: 3.5 hours
Official Counter: Ajit Antony
Observers: Liza Antony
Visitors:
Zak Hepler texted me yesterday wanting to come to the watch, presumably to
find BW. The raptors were so very high today, I texted him not to come
today, but rather to wait until the spring watch when migrant raptors are
more frequent and lower.
Weather:
Winds were light from the NW, temperature 19 to 23° C, low humidity 20%,
cloud cover 70% to 65% high cirrus, clear visibility to 24 km.
Raptor Observations:
Exploratory fall count 2025.
See:https://groups.google.com/g/cobirds/c/Oznn4uc6MBk
The first migrant was an RT to the West at 10:37 a.m. MDT. At 11:24 a.m.
Liza remarked on a pretty cloud overhead and to the SW, and she found two
migrants that I didn't see. Thereafter I looked in that channel, helped by
high cirrus clouds, and was able to find 5 more migrants which were
completely at the limit of binocular ID, though after 12:15 pm the only
migrant I was able to find was a high overhead GE at 12:38 p.m., presumably
because of its large size and dark coloration.
At 11:28 a.m. and 12:15 p.m. I had 2 dark morph juvenile RT - both with
translucent square window panels, the first having a light red tail
indicating it was changing to adult plumage.
Non-migrant Raptors: CH 1, RT 1 TV 2.
Non-raptor Observations:
Black-capped and Mountain Chickadee, Steller's Jay 1, Say's Phoebe 1, Barn
Swallow 2, Northern Flicker 1.
Predictions:
The winds aloft are predicted to come from the NW at 8 km/h, similar to
today.
========================================================================
Report submitted by Official Counter of the day shown above (<dinoridgehw...>)
Dinosaur Ridge - Denver Field Ornithologists information may be found at:
www.dinosaurridgehawkwatch.org
Site Description:
Dinosaur Ridge is the only regularly staffed hawk watch in Colorado and is
the best place in the world to see migrating Ferruginous Hawks. Hawk
watchers may see 17 species of migrating raptors; and it is an excellent
site to see rare dark morph buteos including Broad-winged hawk,
Swainson’s hawk, Ferruginous hawk, Rough-legged hawk and Red-tailed Hawk.
Other raptors we see include Golden and Bald Eagles, Northern harrier,
Osprey, Peregrine Falcons, Prairie Falcons, Cooper's and Sharp-shinned
Hawks, American Kestrels, Merlin, and Turkey Vultures. American Goshawk is
uncommon but also counted each season. Non-raptor species include Rock
Wren, Bushtit, Western Bluebird, Sandhill Crane, White-throated Swift,
American White Pelican, and Dusky Grouse. Birders of any skill level are
always welcome. The hawk watch at Dinosaur Ridge is staffed by Hawk
Counter(s) and volunteers from March through early May.
Directions to site:
From exit 259 on I-70 towards Morrison, drive south under freeway and take
left into first parking lot, the Stegosaurus lot. Follow hawk watch signs
from the southwest end of the parking lot to the hawk watch site. The hike
starts heading east on an old two-track and quickly turns south onto a
trail on the west side of the ridge. When the trail nears the top of the
ridge, turn left, and walk to the flat area at the crest of the ridge.
(Distance: 0.56 miles, Elevation gain: 259 feet)
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Date: 9/26/25 2:11 pm From: Chicobander <jshieldcastle...> Subject: [cobirds] Chico Basin Ranch Banding Station-Bird Conservancy of the Rockies-9/26/2025
Well, if anyone looked at Birdcast overnight you saw the Central plains states were lit up like a football field at night. I am glad the birds appeared somewhere because they do not appear to be many passing through SE Colorado. Wind patterns and weather will be the most determinant of bird migration. Chico Basin Ranch did not have many birds present today. We did have enough for educating 75 5th graders from Gold Camp. It was a pleasant day for them to visit and I think they took away a few bits of bird knowledge with them. Thanks to all the volunteers and BCR staff that pitched in today to make it a great experience for the students!
*1 Wilson's Warbler recapture- gained.2g weight in 2 days*
The banding station will be open tomorrow from sunrise until @ noon. Stop by and share your sightings with us. The Burrowing Owls- sometimes one sometimes 2 were still around the intersection of east banding road and the main ranch road (Peyton Hwy). If interested in visiting or birding the ranch, please sign up on the Aiken Audubon website. *www.aikenaudubon.com <http://www.aikenaudubon.com>*
Have a good weekend,
Julie Shieldcastle Chico Basin Ranch Bird Bander Bird conservancy of the Rockies
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Daniel Carrier, Boulder County Audubon Society Boulder, Boulder County
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Date: 9/26/25 1:56 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (09/26/25) – Mesa Co.
A little calm before the storm in terms of weather patterns. We hadn’t seen
many warblers in the area the last few days, but it looks like last night
was favorable for another warbler push.
*7 Newly Banded Birds:*
Mourning Dove: 1
Mountain White-crowned Sparrow: 2
Orange-crowned Warbler: 3
Wilson’s Warbler: 1
*0 Recaptured Birds:*
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around! Or join us on our Public Day on Sept 27th
.
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Meredith McBurney
Bander - Barr Lake Banding Station
Bird Conservancy of the Rockies
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Date: 9/25/25 2:46 pm From: Mietron Shahbodaghloo <m.shahbodaghloo...> Subject: [cobirds] Grand Valley Audubon Banding Station - Bird Conservancy of the Rockies (09/25/25) – Mesa Co.
Although we got 15 total birds, today was very slow. Our first net brought
back 12 of the birds for the day. Our first flock of bushtit from opening
day came back through and we got one more new bird from that flock with
some recaps. We had nice a diversity of species today with the highlight
being our first Ruby-crowned Kinglet and Song Sparrow.
*10 Newly Banded Birds:*
Bushtit: 1
Gambel’s White-crowned Sparrow: 3
House Finch: 1
Ruby-crowned Kinglet: 1
Song Sparrow: 1
Spotted Towhee: 2
Woodhouse’s Scrub-Jay: 1
*5 Recaptured Birds:*
Bushtit: 4
Mountain White-crowned Sparrow: 1
The station will operate daily (Monday-Friday) from around 7:00a-1:00p
(weather dependent) until October 10th.
We’re located at James M Robb Colorado River State Park by the Kingfisher
parking lot. Follow the yellow signs pointing to the banding station! Feel
free to stop by when we’re around! Or join us on our Public Day on Sept 27th
.
GVAS Bird Bander | Mesa County
Bird Conservancy of the Rockies
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Date: 9/25/25 1:32 pm From: Chicobander <jshieldcastle...> Subject: [cobirds] Chico Basin Ranch Banding Station- Bird Conservancy of the Rockies- 9/25/2025
I sure hope the birds are doing well somewhere or just flying over the ranch to another stopover site to the south of here. We caught our 3rd Sharp-shinned Hawk for the season. Today it was an adult male- beautiful or should I say handsome bird! Another Handsome bird was an adult male Spotted Towhee. Ruby- colored eye set in the velvet black feathered head made him look ready to go to a party. There are still some straggler species around- a Hatching year Black-chinned Hummingbird and a Lazuli Bunting.
*20 New Banded Birds* Wilson's Warbler-6 American Goldfinch-3 Lazuli Bunting- 1 Lincoln's Sparrow- 1 Gambel's White-crowned Sparrow- 5 Gray Catbird- 1 Spotted Towhee-1 Brown Thrasher- 1 Sharp-shinned Hawk- 1
No Recaptures- Good to know the birds are fattening up and on their way south.
The Banding Station will be operating tomorrow from sunrise until around noon. A piece of information is that there will be a large elementary student group there after 9:30am. If birding or visiting the ranch, please sign up on the Aiken Audubon website. *www.aikenaudubon.com <http://www.aikenaudubon.com>*
Have a great day,
Julie Shieldcastle Chico Basin Ranch Bird Bander Bird Conservancy of the Rockies
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Date: 9/25/25 10:16 am From: Brandon <flammowl17...> Subject: [cobirds] Pueblo birds this week
Hi all,
I saw and photographed a Philadelphia Vireo and saw an immature male Rose-breasted Grosbeak at Valco Ponds in Pueblo. There were 11 juvenile Sabine's Gulls off West Fishing Road at Pueblo Reservoir.
On Wednesday, I checked out Swallows State Wildlife Area, seven species of shorebirds including Sanderling, 2 Pectoral Sandpipers, and a Semipalmated Plover.
On Tuesday, a very early Pacific Loon and two Common Loons at Pueblo Reservoir.
On Monday, an adult Lesser Black-backed Gull, Common Loon, Sabine's Gulls, a Forster's Tern, and a Pectoral Sandpiper all at Pueblo Reservoir.
Brandon Percival Pueblo West, CO (soon not to be)
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