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classification

Gaviiformes
Gaviidae
Podicipediformes
Podicipedidae
Procellariiformes
Diomedeidae
Procellariidae
Hydrobatidae
Pelecaniformes
Pelecanidae
Sulidae
Phalacrocoracidae
Fregatidae
Ciconiiformes
Ardeidae
Threskiornithidae
Ciconiidae
Phoenicopteriformes
Phoenicopteridae
Anseriformes
Anatidae
Falconiformes
Pandionidae
Accipitridae
Falconidae
Galliformes
Tetraonidae
Phasianidae
Gruiformes
Gruidae
Rallidae
Otididae
Turniciformes
Turnicidae
Charadriiformes
Charadriidae
Recurvirostridae
Haematopodidae
Jacanidae
Rostratulidae
Scolopacidae
Glareolidae
Stercorariidae
Laridae
Alcidae
Pterocletiformes
Pteroclidae
Columbiformes
Columbidae
Cuculiformes
Cuculidae
Strigiformes
Strigidae
Caprimulgiformes
Caprimulgidae
Apodiformes
Apodidae
Trochilidae
Coraciiformes
Coraciidae
Alcedinidae
Upupiformes
Upupidae
Piciformes
Picidae
Passeriformes
Pittidae
Hirundinidae
Alaudidae
Motacillidae
Campephagidae
Pycnonotidae
Laniidae
Oriolidae
Dicruridae
Sturnidae
Corvidae
Bombycillidae
Cinclidae
Troglodytidae
Prunellidae
Sylviidae
Regulidae
Muscicapidae
Monarchidae
Turdidae
Paradoxornithidae
Aegithalidae
Remizidae
Paridae
Sittidae
Certhiidae
Zosteropidae
Ploceidae
Fringillidae
Parulidae
Emberizidae
Icteridae