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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