Be careful calling them females... Juvenile male Cassin's Finches, like
Purple Finches don't get their red color until the spring/summer of
their second year. So some of those that look like females may actually
be juvenile males
So it is better to call them "female types"
A goo way to tell adult female finches from juvenile (sex unknown) id
to look at their tail feathers.
Adult female birds will have rounded tail feathers, and juvenile birds
will have pointed tail feathers.
Best,
Scott Rashid
Estes Park
On 4/16/2020 2:48 PM, JIM THOMPSON wrote:
First time in back yard. Here for three days. About 25 mostly
female. First time in yard.
JIM THOMPSON
On April 16, 2020 at 2:45 PM Richard Trinkner
<richardinboul...@gmail.com> wrote:
I'd be very interested in theories to explain this spring's dramatic
Cassin's Finch invasion of the lower elevations of the Front Range.
We usually get these prolific snow storms in March and April, but my
24 years of personal records don't show anything previously like this
year's Cassin's Finch invasion. (Of course, 24 years is a tiny data
window for a species that probably predates humans...)
Are cone crops in the high country poor this year? Are the finches
coming from northern latitudes? Was last year a banner breeding year?
Why is the weather disproportionately affecting this particular
high-elevation finch species?
I don't have any answers myself, but hope that others might.
Cheers,
Richard Trinkner
Boulder
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