Abundance: Accidental Habitat: Shore or mudflat; Open water; Seen most often in flight Slide #29.01.11 - Adult, alternate (Jul 1). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature. Slide #29.01.07 - 2nd year, alternate (Jul 1). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature. Slide #29.01.01 - Hybrid with Herring Gull, 1st year, winter (Feb 4). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.