Lesser Black-backed and Glaucous notes and photos


Noah Arthur
 

Here's an eBird checklist with (bad) photos and field notes on the Clifton Court Forebay LESSER BLACK-BACKED GULL, plus some slightly better photos of the GLAUCOUS GULL: https://ebird.org/view/checklist/S50482307
Note that there may have been two Glaucous, and at least one of them didn't look particularly big; it was about Herring size at most. However, it's very white and the bill is too long and sharply bicolored for it to be an Iceland; it should be easy to pick out.

Western Gulls are rare in this part of Contra Costa Co., so the Lesser Black-backed may be the only dark-backed gull on the lake and should also be pretty easy to pick out if it returns. If any Westerns do show up, they should be easily distinguished from the Lesser by their larger size (the Lesser looked no bigger than a California Gull), bulkier structure, and larger bills. 
Noah

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John Luther
 

LBB Gull continued this morning. Not where Noah saw it, but on levee across water from south end of fisherman's parking lot. Large number of gulls preening and stretching at 7:30 am before flying west to landfill on top of hills. Gulls already returning to forebay now at 9:45.

John Luther
Oakland
On Dec 7, 2018, at 12:16 AM, Noah Arthur semirelicta@... [EBB_Sightings] <EBB_Sightings-noreply@...> wrote:

Here's an eBird checklist with (bad) photos and field notes on the Clifton Court Forebay LESSER BLACK-BACKED GULL, plus some slightly better photos of the GLAUCOUS GULL: https://ebird.org/view/checklist/S50482307
Note that there may have been two Glaucous, and at least one of them didn't look particularly big; it was about Herring size at most. However, it's very white and the bill is too long and sharply bicolored for it to be an Iceland; it should be easy to pick out.

Western Gulls are rare in this part of Contra Costa Co., so the Lesser Black-backed may be the only dark-backed gull on the lake and should also be pretty easy to pick out if it returns. If any Westerns do show up, they should be easily distinguished from the Lesser by their larger size (the Lesser looked no bigger than a California Gull), bulkier structure, and larger bills.
Noah

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