[Tweeters] Help with Gull ID

[Dan McDougall-Treacy via Tweeters]

 Yesterday 9/13/24 at the mouth of Cedar River I watched a gull that has me
stumped.
Here is the note I added to my ebird checklist, and some digiscoped photos
are linked below.
I'd appreciate any thoughts that are out there regarding this bird.
"The most striking field mark is a black bill, yellow at the tip (though
clearly not a Sabine’s). Bill smallish and sharply pointed, and rounded at
upper mandible giving a hooked appearance. Medium gray mantle. Mottled
white head and breast. Pale pink feet. Black-ish wing tips. Overall size
similar to CAGU, RBGU."
Photos here:

https://photos.google.com/album/AF1QipOCcov5RyI5mCwU6vi6DZkh0tVKBK3_D3F7Lhio


Dan McDougall-Treacy
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