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classification

Gaviiformes
Gaviidae
Podicipediformes
Podicipedidae
Pelecaniformes
Pelecanidae
Phalacrocoracidae
Ciconiiformes
Ardeidae
Threskiornithidae
Ciconiidae
Phoenicopteriformes
Phoenicopteridae
Anseriformes
Anatidae
Falconiformes
Pandionidae
Accipitridae
Falconidae
Galliformes
Tetraonidae
Phasianidae
Gruiformes
Gruidae
Rallidae
Otididae
Charadriiformes
Burhinidae
Charadriidae