Most lariphiles agree some first cycle pale-headed gulls are challenging. So much variation.
Can you you elaborate on those "checked boxes" you mention?
Bruce Webb
Former Boulder resident
On Sun, Mar 28, 2021 at 11:42 AM Nicholas Komar <quetzal65@comcast.net> wrote:
A first cycle large white-headed Gull at Horseshoe Reservoir in Loveland (Larimer) seems to check most boxes for Slaty-backed Gull. See photos below. Warning: this age/species combo is very difficult to confirm so may not get confirmed in eBird or accepted by a records committee. But wanted to share to give folks an opportunity to look for it.
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Nick Komar
Fort Collins CO
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Bruce Webb
Granite Bay, California
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