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classification

Gaviiformes

Podicipediformes

Procellariiformes

Pelecaniformes

Ciconiiformes

Phoenicopteriformes

Anseriformes

Falconiformes

Galliformes

Gruiformes

Charadriiformes

Pterocletiformes

Columbiformes

Cuculiformes

Strigiformes

Caprimulgiformes

Apodiformes

Coraciiformes

Upupiformes

Piciformes

Passeriformes