Date: 12/4/25 5:03 pm From: Virginia Holman <virginiaholmanwrites...> Subject: [cobirds] Re: Bushit range expansion
Folks,
Thanks for all the great local sources and data on Bushtits. And the great
YouTube presentation.
All very helpful and informative!
One more question:
I'm seeing anecdotal chatter regarding climate shifts and human activity as
causes for expansion. Is there any ongoing or published research regarding
this re: Bushtits
and co-occurring avifauna?
Thanks again.
Virginia Holman
On Thu, Dec 4, 2025 at 4:32 PM Ted Floyd <tedfloyd73...> wrote:
> Hey, Virginia & all.
>
> Bill Schmoker gives us Boulder CBC data for 2004 onward. Okay, but how
> about before that time? Here is the rest of the story, told with great
> dramatic effect:
>
> youtube.com/watch?v=z7jA-KJ6RCM&t=749s
>
> Ted Floyd
> Lafayette, Boulder Co.
>
> =============================================
>
> Hi Virginia- I was already digging around a little in the Boulder CBC
> archives in preparation for this year's count and thought I'd look back to
> see what our Bushtit situation has been for the last 20 years. I wonder if
> a CO-wide CBC picture could also be produced but haven't looked into that.
> Anyway, here's what we've had on the count since 2004:
> 2004: 8 (in 1 territory)
> 2005: 4 (feeder watcher)
> 2006: 20 (in 1 territory)
> 2007: 7 (1)
> 2008: 19 (4)
> 2009: 46 (2)
> 2010: 58 (3)
> 2011: 67 (2)
> 2012: 96 (6)
> 2013: 8 (1)
> 2014: 86 (7)
> 2015: 110 (4)
> 2016: 27 (5)
> 2017: 163 (9)
> 2018: 174 (10)
> 2019: 92 (6)
> 2020: 135 (8)
> 2021: 146 (9)
> 2022: 178 (10)
> 2023: 142 (11)
> 2024: 173 (7)
>
> So definitely the expected ups and downs but overall I see a pretty strong
> increase both in numbers of birds and in numbers of territories reporting
> Bushtits in our last 20 counts. I suspect that our earlier counts would
> show even more Bushtit paucity.
>
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