bird
The birds are bipeded, thermostatic, ovipaetic vertebrates, wearing feathers, forelimbs evolved into wings, with hard beaks. The bird is a taxonomy on the subclass of a vertebrate. Because of its body covered with feathers, ancient Chinese zoology collectively referred to as plum. Birds of different sizes, the largest ostrich height up to 2.5 meters, while the smallest suction bee bird body length of only 5 cm. There are more than 10,000 kinds of existing birds known to the world, there are parrots, hummingbirds, Acacia, and other birds. There are only 1,300 species recorded in China, of which there are at least 70 species. Compared with other terrestrial vertebrates, birds are a species with many unique physiological characteristics. ...