Bonaparte's Gull, Larus philadelphia

Abundance: Common
Season: Winter/non-breeding season
Habitat: Shore or mudflat; Open water; Seen most often in flight

Slide #29.13.32 - Adult, alternate (Jun 2). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.

Slide #29.13.42 - Adult, basic (Dec 15). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.

Slide #29.13.23 - Adult, basic in flight, feeding (Jan 18). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.

Slide #29.13.38 - Adult, basic molting to alternate (Mar 22). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.

Slide #29.13.38 - 1st year, basic (Feb 11). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.

Slide #29.13.34 - 1st year, basic, in flight (Apr 18). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.