 Ratite birds (ostrich & allies) Taxonomic families: 6 Extant species: 59 |
 Galliformes (grouse, quail, & allies) Taxonomic families: 5 Extant species: 282 |
 Anseriformes (ducks, geese, & swans) Taxonomic families: 3 Extant species: 162 |
 Sphenisciformes (penguins) Taxonomic families: 1 Extant species: 17 |
 Gaviiformes (loons) Taxonomic families: 1 Extant species: 5 |
Procellariiformes (tube-nosed seabirds) Taxonomic families: 4 Extant species: 112 |
 Podicipediformes (grebes) Taxonomic families: 1 Extant species: 22 |
 Phoenicopteriformes (flamingos) Taxonomic families: 1 Extant species: 5 |
 Ciconiiformes (storks, herons, & allies) Taxonomic families: 3 Extant species: 116 |
 Pelecaniformes (pelicans & allies) Taxonomic families: 8 Extant species: 65 |
Falconiformes (hawks, eagles, & allies) Taxonomic families: 3 Extant species: 304 |
Gruiformes (cranes, rails, & allies) Taxonomic families: 12 Extant species: 220 |
 Charadriiformes (gulls, shorebirds, & allies) Taxonomic families: 17 Extant species: 466 |
Columbiformes (pigeons & doves) Taxonomic families: 1 Extant species: 308 |
Psittaciformes (parrots & allies) Taxonomic families: 1 Extant species: 364 |
Musophagiformes (turacos & louries) Taxonomic families: 1 Extant species: 23 |
 Cuculiformes (cuckoos, anis, & allies) Taxonomic families: 1 Extant species: 138 |
Strigiformes (owls) Taxonomic families: 2 Extant species: 195 |
Caprimulgiformes (nightjars & allies) Taxonomic families: 5 Extant species: 119 |
Apodiformes (hummingbirds & swifts) Taxonomic families: 3 Extant species: 430 |
Coliiformes (mousebirds) Taxonomic families: 1 Extant species: 6 |
Trogoniformes (trogons) Taxonomic families: 1 Extant species: 40 |
 Coraciiformes (kingfishers, motmots, & allies) Taxonomic families: 11 Extant species: 209 |
Piciformes (woodpeckers, puffbirds, & allies) Taxonomic families: 5 Extant species: 420 |
Passeriformes (perching birds) Taxonomic families: 97 Extant species: >6000 |
 Opisthocomiformes (hoatzin) Taxonomic families: 1 Extant species: 1 |