Taxonomy

Struthioniformes
Rheiformes
Tinamiformes
Casuariiformes
Apterygiformes
Anseriformes
Galliformes
Phoenicopteriformes
Podicipediformes
Columbiformes
Mesitornithiformes
Pterocliformes
Otidiformes
Musophagiformes
Cuculiformes
Caprimulgiformes
Opisthocomiformes
Gruiformes
Charadriiformes
Eurypygiformes
Phaethontiformes
Gaviiformes
Sphenisciformes
Procellariiformes
Ciconiiformes
Suliformes
Pelecaniformes
Cathartiformes
Accipitriformes
Strigiformes
Coliiformes
Leptosomiformes
Trogoniformes
Bucerotiformes
Coraciiformes
Galbuliformes
Piciformes
Cariamiformes
Falconiformes
Psittaciformes
Passeriformes