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Birds are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. With around 10,000 living species, they are the most speciose class of tetrapod vertebrates. Birds inhabit ecosystems across the globe, from the Arctic to the Antarctic. They emerged within theropod dinosaurs during the Jurassic period, around 150 million years ago.

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Archaeopteryx.jpg † Archaeopteryx Character Options Hesperornis-1.jpg † Hesperornis & allies Struthioniformes.jpg Ostriches & allies Procellariiformes 1.jpg Albatrosses & allies
† Bony-toothed birds PNSO Confuciusornis Yoyo.jpgConfuciusornis Suliformes.jpg Cormorants & allies Cranes.jpg Cranes & allies
Cuculiformes.jpg Cuckoos & allies Columbiformes.jpg Doves and pigeons Accipitriformes.jpg Eagles & allies Falconiformes.jpg Falcons & Caracaras
Phoenicopteriformes.jpg Flamingos Gastornis.jpg † Gastornis & allies Grebes.jpg Grebes Charadriiformes.jpg Gulls & allies
Bucerotidae.jpgHornbills Hummingbird.JPGHummingbirds Coraciiformes.jpgKingfishers & allies Kagu.jpg Kagu & allies
Galliformes.jpg Landfowl Great Northern Loon.JPGLoons YowieGiantMoa.jpg † Moas 797px-YowieAus2TawnyFrogmouth 1.JPG Nightjars & allies
VtgAlexornis.jpg† 'Opposite birds' Owls.jpg Owls Psittaciformes.jpg Parrots Passerines.jpg Passerines
Pelecaniformes.jpg Pelicans & allies Erect-crested Penguin.jpg Penguins Terror Birds.jpg † Terror Birds Ciconiidae.jpg Storks
Toucans.jpg Toucans Resplendent Quetzal.JPG Trogons Touraco de Fischer-1.jpgTuraco & allies Anseriformes.jpg Waterfowl
Black woodpecker.jpg Woodpeckers & allies