Great Black-backed Gull
(Larus marinus)
Photographed in Bar-Harbor, Maine, and in Boston, Massachusetts, by Jim Rosso
Bottom left picture show one Gt. Black-backed Gull sitting with a group of American Herring Gulls.

Charadriiformes
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Black-backed Gull

First year plumge

Black-backed Gull
Black-backed Gull
Other members of the genus Larus:
Mew Gull
Ring-billed Gull
Yellow-footed Gull
California Gull
Heermann's Gull
Laughing Gull
Franklin's Gull
Bonaparte's Gull
Glaucous-winged Gull
Western Gull
American Herring Gull