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This table depicts one of the many avian classification systems, which identifies 27 orders of birds, divided largely on the basis of their internal features. The debate over bird classification continues with the introduction of new data and information. New fossil evidence appears regularly, while ornithologists continually reevaluate older evidence and study living organisms.
| Anseriformes |
Waterfowl (ducks, geese, swans) |
| Apodiformes |
Swifts, hummingbirds |
| Caprimulgiformes |
Goatsuckers, nightjars |
| Charadriiformes |
Shorebirds, gulls, alcids, jacanas, skuas, terns, skimmers, oystercatchers, avocets |
| Ciconiiformes |
Herons, storks, ibis, spoonbills, bitterns |
| Coliiformes |
Colies |
| Columbiformes |
Pigeons, doves, sandgrouse |
| Coraciiformes |
Kingfishers, bee-eaters, rollers, hoopoes, hornbills, motmots, todies |
| Cuculiformes |
Cuckoos, anis, roadrunners, hoatzins |
| Falconiformes |
Vultures, hawks, eagles, falcons, osprey, secretary birds |
| Galliformes |
Grouse, pheasants, turkeys, quails, ptarmigans, megapods, guinea fowl, guans |
| Gaviiformes |
Loons |
| Gruiformes |
Cranes, rails, bustards, limpkins, coots, gallinules, buttonquails, sunbitterns, kagus, trumpeters |
| Passeriformes |
Perching birds (over 70 families), including crows, thrushes, sparrows, swallows, wrens, warblers, flycatchers, larks, nuthatches, vireos, shrikes, blackbirds |
| Pelecaniformes |
Pelicans, boobies, cormorants, gannets, darters, frigatebirds |
| Phoenicopteriformes |
Flamingos |
| Piciformes |
Woodpeckers, honey guides, toucans, jacamars, puffbirds, barbets |
| Podicipediformes |
Grebes |
| Procellariiformes |
Albatrosses, shearwaters, petrels |
| Psittaciformes |
Parrots |
| Sphenisciformes |
Penguins |
| Strigiformes |
Owls |
| Struthioniformes |
Ostriches, rheas, kiwis, cassowaries, emus |
| Tinamiformes |
Tinamous |
| Trogoniformes |
Trogons |
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