鳥類の進化・分類
Subclass: Archaeornithes has thrived in Jurassic era whereas subclass: Enanthiornithes, Odontornithes in Cretaceous. Ratites are the birds which do not fly. Some birds such as swifts lowers the body temperature to conserve energy. Allopreening is a social behavior of pigeons, penguins, owls. The gastrointestinal tract of aves has crops, glizzard and coalaca. The coracoid of birds are prominent. Coracoid connects scapula and sternal keel. Clavicles are fused into furcula. Most of the orders are named after the Latin names of birds, e.g. passer(sparrow), pici(woodpecker), pisttacus(parrot), coumba(pigeon), gallus(cock), grus(crane), anser(goose), strix(owl), ciconia(stork), capra(she-goat), struthiocamlus(ostrich). Here are listings of the origins of words: carus(fall), colis(=caulis, stalk) sphaera(sphere), podium(balcony), chara(root), procello(storm), caprimullgus(goat-milker=countryman).
Table 7: Orders in class: Aves