Date: 12/4/25 7:01 pm From: T. Luke George <t.luke.george...> Subject: Re: [cobirds] Bushit range expansion
Hi All,
I plotted the data and despite the ups and downs, the increase is
remarkably consistent. The number of Bushtits on the count has increased by
about 9 birds per year since 2005. The R squared of 0.73 which is very high
for an ecological data set.
Best,
Luke George
[image: image.png]
On Thu, Dec 4, 2025 at 6:36 PM Virginia Holman <
<virginiaholmanwrites...> wrote:
> Excellent. Thank you so much.
>
> On Thu, Dec 4, 2025 at 6:24 PM Ted Floyd <tedfloyd73...> wrote:
>
>> On Thu, Dec 4, 2025 at 5:14 PM linda hodges <hikerhodges...>
>> wrote:
>>
>>> Virginia, I'm beginning to think you set up Bill and Ted!
>>>
>>
>> Oy, those CBCs back in the good ole daze, the best of times:
>>
>> [image: Bill and Ted.png]
>>
>> Zoomers and Millennials, you have no idea what real culture was like.
>> Meanwhile:
>>
>> > 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?
>>
>> But of course. (Searches for Grey Poupon emoji...)
>>
>> From the WFO convention in Ventura in 2018 and then from the WFO-CFO
>> convention at Copper Mountain in 2023, these riveting potboilers:
>>
>> [image: WFO.png]
>>
>> [image: WFO-CFO.png]
>>
>> Ted Floyd
>> Lafayette, Boulder Co.
>>
>>
>>>
>>> *Linda Hodges*
>>>
>>>
>>>
>>> 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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--
*T. Luke George, PhD*
*Master Instructor, **Colorado State University*
*Department of Fish, Wildlife, and Conservation Biology*
*Wagar 110*
*970-491-3311 (o)*
Professor Emeritus, Humboldt State University
707-499-4053 (c)
*<t.luke.george...> <t.luke.george...>*
"what is it you plan to do with your one wild and precious life?" Mary
Oliver
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