See orders * Infraclass Palaeognathae
- Superorder Struthionimorphae
- Struthioniformes (Ostrichs) – 58?–0 Mya, Late Paleocene?–Present
- Superorder Notopalaeognathae
- Rheiformes (Rheas) – 56–0 Mya, Late Paleocene–Present
- Tinamiformes (Tinamous) – 10–0 Mya, Middle Miocene–Present
- Casuariiformes (Casowaries and Emus) – 58.7–0 Mya, Late Paleocene–Present
- Apterygiformes (Kiwis) – 23.03–0 Mya, Early Miocene–Present
- Infraclass Neognathae
- Superorder Galloanserae
- Galliformes (Gamebirds) – 45–0 Mya, Middle Eocene–Present
- Anseriformes (Waterfowl) – 71–0 Mya, Late Cretaceous (Maastrichtian)–Present
- Superorder Neoaves
- Phoenicopteriformes (Flamingos) – 50–0 Mya, Early Eocene–Present
- Podicipediformes (Grebes) – 25–0 Mya, Late Oligocene–Present
- Columbiformes (Pigeons and doves) – 23.03–0 Mya, Early Miocene–Present
- Mesitornithiformes (Mesites) – No fossil records
- Pterocliformes (Sandgrouse) – 33.9–0 Mya, Late Oligocene–Present
- Apodiformes (swifts, treeswifts and hummingbirds) – 52–0 Mya, Early Eocene–Present
- Caprimulgiformes (Nightjars, nighthawks, potoos, oilbirds, frogmouths and owlet-nightjars) – 59.2–0 Mya, Middle Paleocene–Present
- Cuculiformes (Cuckoos, anis, etc) – 34–0 Mya, Late Miocene–Present
- Otidiformes (Bustards, floricans, etc) – 13–0 Mya, Middle Miocene–Present
- Musophagiformes (Turacos and go-away-birds) – 24–0 Mya, Late Oligocene–Present
- Opisthocomiformes (Hoatzin) – 33.9–0 Mya, Late Eocene–Present
- Gruiformes (Cranes, crakes, rails, wood-rails, fluftais, gallinules, limpkins, trumpeters, finfoots and sungrebes) – 66–0 Mya, Late Cretaceous (Maastrichtian)–Present
- Charadriiformes (Plovers, crab plovers, lapwings, seagulls, puffins, auks, sandipipers, buttonquails, stilts, avocets, ibisbills, woodcocks, skuas, etc) – 75–0 Mya, Late Cretaceous (Campanian)–Present
- Gaviiformes (Loons) – 70–0 Mya, Late Cretaceous (Maastrichtian)–Present
- Procellariiformes (petrels, storm petrels, albatrosses and diving petrels) – 33.9–0 Mya, Early Oligocene–Present
- Sphenisciformes (penguins) – 62–0 Mya, Early Paleocene–Present
- Ciconiiformes (storks, openbills and jabirus) – 30–0 Mya, Early Oligocene–Present
- Suliformes (boobiess, gannets, fregatbirds, cormorants, shags and anhigas) – 90–0 Mya, Late Cretaceous (Turonian)–Present
- Pelecaniformes (pelicans, ibises, shoebills, egretts, herons, etc) – 66–0 Mya, Late Cretaceous (Maastrichtian)–Present
- Eurypygiformes (sunbitterns and kagu) – 56–0 Mya, Late Paleocene–Present
- Phaethontiformes (tropicbirds) – 58.7–0 Mya, Late Paleocene–Present
- Cathartiformes (New World vultures) – 41–0 Mya, Middle Eocene–Present
- Accipitriformes (eagles, Old World vultures, secretary-birds, hawks, harriers, etc) – 47–0 Mya, Late Eocene–Present
- Strigiformes (owls) – 30–0 Mya, Early Oligocene–Present
- Coliiformes (mousebirds) – ~65–0 Mya, Early Paleocene–Present
- Leptosomiformes (cuckoorollers) – No fossil record
- Trogoniformes (trogons and quetzals) – 49–0 Mya, Early Eocene–Present
- Bucerotiformes (hornbills, hoopoes and wood-hoopoes) – ~40–0 Mya, Middle Eocene–Present
- Coraciiformes (rollers, bee eaters, todys, kingfishers, etc) – 41.2–0 Mya, Middle Eocene–Present
- Piciformes (woodpeckers, flickers, toucans, aracaris, motmots, etc) – 56–0 Mya, Early Eocene–Present
- Cariamiformes (seriema) – 66–0 Mya, Late Cretaceous (Maastrichtian)–Present
- Falconiformes (falcons and caracaras) – 50–0 Mya, Early Eocene–Present
- Psittaciformes (parrots and cockatoos) – 50–0 Mya, Early Eocene–Present
- Passeriformes (passerines) – 52.5–0 Mya, Early Eocene–Present
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