classification
Gaviiformes
Podicipediformes
Procellariiformes
Pelecaniformes
Ciconiiformes
Phoenicopteriformes
Anseriformes
Falconiformes
Galliformes
Gruiformes
Turniciformes
Charadriiformes
Pterocletiformes
Columbiformes
Cuculiformes
Strigiformes
Caprimulgiformes
Apodiformes
Coraciiformes
Upupiformes
Piciformes
Passeriformes