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Sandwich Tern

白嘴端鳳頭燕鷗 · 白嘴端凤头燕鸥 · 白嘴端鳳頭燕鷗 · Sterne caugek · Charrán patinegro

Thalasseus sandvicensis

A tern with a black "punk" crest and a yellow-tipped black beak — like it's been dipped in mustard!