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Mammals --- Birds --- Hibernation. --- Physiology. --- Aves --- Avian fauna --- Avifauna --- Wild birds --- Amniotes --- Vertebrates --- Ornithology --- Eutheria --- Mammalia --- Mammalians --- Prototheria --- Theria --- Mammalian physiology --- Physiology --- Mamífers --- Ocells --- Hivernació --- Fisiologia animal --- Fisiologia --- Etologia --- Aus --- Vertebrats --- Anseriformes --- Apodiformes --- Caradriformes --- Ciconiformes --- Columbiformes --- Estruços --- Falconiformes --- Fasianiformes --- Gruïformes --- Lloros --- Mussols --- Ocells de gàbia --- Ocells nocturns --- Ocells tropicals --- Passeriformes --- Pelicaniformes --- Piciformes --- Pingüins --- Procel·lariformes --- Rapinyaires --- Caixes niu per a ocells --- Menjadores per a ocells --- Ornitologia --- Carnívors --- Insectívors (Mamífers) --- Lagomorfs --- Mamífers aquàtics --- Monotremes --- Primats --- Marsupials --- Ratapinyades --- Rosegadors