Date: 12/4/25 1:30 pm From: David Suddjian <dsuddjian...> Subject: Re: [cobirds] Bushtit Range Expansion
You might look at the results of the two breeding bird atlas efforts to
look for some indication of range expansion, but these will predate the
past 10-15 years, mostly. You can also look at eBird species maps for
particular years and compare things among years. This is somewhat
anecdotal, as it is based on what people happened to have reported (and
there has been a marked increase in eBird use over that time period) but
might have some useful info. Trend info from the North American Breeding
Bird Survey might be of interest, too, looking at results of
particular routes or the state as a whole. But these will emphasize
roadside results in less developed areas away from some of the more
developed regions where Bushtits are perhaps most frequent.
David
On Thu, Dec 4, 2025 at 2:25 PM Virginia Holman <
<virginiaholmanwrites...> wrote:
> Hi,
>
> Are there any studies/reports re: the Bushtit range expansion in Colorado
> in the last 10-15 years?
>
> I'm coming across significant anecdotal information from longtime birders
> in the region, but nothing formal/science-based yet.
>
> Thanks for any guidance.
>
> Virginia Holman
>
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