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Kingdom: Animalia (Animal) Phylum/Division: Chordata (chordates) Subphylum/Subdivision: Vertebrata (vertebrates) Infraphylum/Infradivision: Gnathostomata (jawed vertebrates) Superclass: Tetrapoda (four-footed) Class: Aves (Birds) Order: Charadriiformes (Alcids, Auks) Family: Laridae (auks, gulls, puffins, murres, terns) Genus: Chroicocephalus (medium to relatively small gulls) Species: Chroicocephalus saundersi (Saunders's Gull, Chinese black-headed gull) Plumage: Breeding Age: Mature Plumage: Breeding Plumage: Missing Species: Chroicocephalus philadelphia (Bonaparte's Gull) Plumage: Non-Breeding Age: Mature Plumage: Non-Breeding