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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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Procellariiformes 1.jpg Albatrosses & allies Archaeopteryx.jpg † Archaeopteryx † 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 Character Options Hesperornis-1.jpg † Hesperornis & allies Bucerotidae.jpgHornbills
Hummingbird.JPGHummingbirds Kagu.jpg Kagu & allies Coraciiformes.jpgKingfishers & allies Galliformes.jpg Landfowl
Great Northern Loon.JPGLoons 797px-YowieAus2TawnyFrogmouth 1.JPG Nightjars & allies VtgAlexornis.jpg† 'Opposite birds' Struthioniformes.jpg Ostriches & allies
Owls.jpg Owls Psittaciformes.jpg Parrots Passerines.jpg Passerines Pelecaniformes.jpg Pelicans & allies
Erect-crested Penguin.jpg Penguins Ciconiidae.jpg Storks Terror Birds.jpg † Terror Birds Toucans.jpg Toucans
Resplendent Quetzal.JPG Trogons Touraco de Fischer-1.jpgTuraco & allies Anseriformes.jpg Waterfowl Black woodpecker.jpg Woodpeckers & allies