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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

Plumage: Breeding
Age: Mature

Plumage: Missing
Species: Chroicocephalus philadelphia (Bonaparte's Gull)

Plumage: Non-Breeding

Plumage: Non-Breeding
Age: Mature