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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-tothed birds Confuciusornis 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 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