Adult, alternate plumage, Doheney Beach, Orange Co., 12-07. © John  C. Avise.

Heermann's Gull

Larus heermanni

Charadriiformes; Laridae

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Adult, alternate plumage, Santa Cruz Island, S. CA., 2-08. © John  C. Avise.
Adult, alternate plumage, Doheney Beach, Orange Co., 1-07. © John  C. Avise.

Adult, basic plumage, Santa Barbara, CA., 10-06. © John  C. Avise.
Adult, basic plumage, Dana Point, Orange Co., 9-07. © John  C. Avise.

Juvenile, Doheney Beach, Orange Co., 2-06. © John  C. Avise.
Juvenile, Doheney Beach, Orange Co., 1-07. © John  C. Avise.

Transitional plumage, Doheney Beach, Orange Co., 7-06. © John  C. Avise.
Transitional plumage, Doheney Beach, Orange Co., 1-07. © John  C. Avise.

Adult, alternate plumage, Crystal Cove, Orange Co., 2-06. © John  C. Avise.