Adult, basic plumage, Doheney Beach, Orange Co., 1-07. © John  C. Avise.

Ring-billed Gull

Larus delawarensis

Charadriiformes; Laridae

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Adult, basic plumage, Doheney Beach, Orange Co., 1-08. © John  C. Avise.
Adult, basic plumage, Martin Co., FL., 1-08. © John  C. Avise.

First-winter plumage, Martin Co., FL., 1-08. © John  C. Avise.
Juvenile, Copper Harbor, MI., 9-06. © John  C. Avise.

First winter plumage, Crystal Cove, Orange Co., 12-05. © John  C. Avise.
Adult, alternate plumage, Dana Point, Orange Co., 3-06. © John  C. Avise.

Adult, basic plumage, Santa Ana River mouth, Orange Co., 2-07. © John  C. Avise.
Adult, basic plumage, Doheney Beach, Orange Co., 11-06. © John  C. Avise.

Adult, basic plumage, Crystal Cove, Orange Co., 12-05. © John  C. Avise.