Bonaparte's Gull
(Larus philadelphia)
Photographed in California, by Jim Rosso.
The bird in the bottom photo has juvenile plumage.

Charadriiformes
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Other members of the genus Larus:

Mew Gull
Great Black-backed Gull
Yellow-footed Gull

Western Gull
Laughing Gull
California Gull
Franklin's Gull

American Herring Gull
Heermann's Gull
Glaucous-winged Gull
Ring-billed Gull

Spring plumage

Bonaparte's Gulls often feed while flying. This photo shows a bird putting its head into the water while it is feeding.