An adult in alternate plumage on a pier.
CitationPieter de Groot Boersma, IBC1555434. Accessible at hbw.com/ibc/1555434.
Pieter de Groot Boersma, IBC1555434. Video of Belcher’s Gull Larus belcheri at Lima City, Peru. Accessible at hbw.com/ibc/1555434.
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