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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 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
Tropicbirds Touraco de Fischer-1.jpgTuraco & allies Anseriformes.jpg Waterfowl Black woodpecker.jpg Woodpeckers & allies