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CORNELL LAB OF ORNITHOLOGY
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AMERICAN ORNITHOLOGISTS' UNION
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Western Gull
Larus
occidentalis
Order
CHARADRIIFORMES
– Family
LARIDAE
Issue No.
174
Authors:
Pierotti, Raymond J., and Cynthia A. Annett
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Adult Western Gull, non-breeding ("winter") plumage; California, September
Adult Western Gull, California, November.
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