First summer plumage, San Joaquin Marsh, Orange Co., 5-07. © John  C. Avise.

Bonaparte's Gull

Larus philadelphia

Charadriiformes; Laridae

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First summer plumage, San Joaquin Marsh, Orange Co., 5-07. © John  C. Avise.
Adult, alternate plumage, Fairbanks, AK., 5-09. © John  C. Avise.

Basic plumages, Santa Ana River Mouth, Orange Co., 5-06. © John  C. Avise.
Adult, basic plumage, Seattle, WA., 8-06. © John  C. Avise.

First-winter plumage, Eldorado Park, Los Angeles Co., 2-07. © John  C. Avise.
First-winter plumage, Eldorado Park, Los Angeles Co., 2-07. © John  C. Avise.

First-winter plumage, Eldorado Park, Los Angeles Co., 2-07. © John  C. Avise.
First-winter plumage, Eldorado Park, Los Angeles Co., 2-07. © John  C. Avise.

First-winter plumage, San Joaquin Marsh, Orange Co., 5-07. © John  C. Avise.