关于鸟的英文介绍,

Birds,also called the birds.Definition:a feathered egg-laying vertebrates,the dictionary explanation:a class of vertebrates,warm-blooded egg-laying,with lung breath,almost the whole body with feathers,hind legs to walk,arms into wings,most can fly.In zoology,the bird's main features are:the body streamlined,fusiform or fusiform,most flying life.Surface coating feathers,general arms into wings wings (some kind degradation); Chest muscle developed; Rectum short,appetite is big digestion is fast,the digestive system developed,helps to lighten the weight,conducive to flight; Heart has two atrial and ventricular,heart beat fast.Temperature constant.Respiratory organs except with lung and formed by lung wall bulge and airbag,used to help to double,breathing.