Date: 12/22/20 1:29 pm
From: Alvaro Jaramillo <chucao...>
Subject: Re: [southbaybirds] Lake Cunningham - Help ID Gulls

Hi there. The one on the left with that strongly bicolored bill is a first cycle (= first year) California Gull. They always show the bicolored bill at that age, Herring can show this feature, but it is not a “must.” Californias tend to look more uneven in plumage above, mix of gray, brown, dark and pale than Herring and they have a face that is dark and streaked with a big bolder white area in front of the eyes and base of bill. The two pale winged birds are perhaps first cycle “Thayer’s” Iceland Gulls, not much bigger than the Cali, without the big thick blob ended bills of Glaucous-winged. They may be hybrids, to be sure one would have to have closer photos, and sometimes even with them you do not know.


Alvaro Jaramillo

<mailto:<alvaro...> <alvaro...>

From: <southbaybirds...> <southbaybirds...> On Behalf Of <amnicklin...>
Sent: Tuesday, December 22, 2020 11:45 AM
To: <southbaybirds...>
Subject: [southbaybirds] Lake Cunningham - Help ID Gulls

Hi everyone! My husband and I started birding at the beginning of the year and discovered this list a few months ago. This is my first time posting.

We had a pretty successful morning birding at Lake Cunningham. Favorites were good views of Common Yellowthroats, American Pipits, and a Spotted Sandpiper. We also added White-Throated Swifts to our life list.

I've been working to get better at gull ID, but am a little stumped by some young grey-colored gulls. In the image with three grey gulls facing to the left, I believe the left-most one is a Herring Gull, the middle one with a feather in its mouth is a Glaucous-Winged Gull, but the one on the right I'm not so sure about. It's wing tips looked darker and longer than the Glaucous-Winged Gull's, so I was wondering if it might be a hybrid, or something else. The second image attached has the Glaucous-Winged Gull on the left and the mystery gull (who stole the feather) on the right. If anyone could confirm my IDs or help with the one I'm stuck on, I'd be grateful for the help. (The images can also be found on ebird list is S77845397 <> )


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