Is it right that the birds are fluttering

It is right that the little bird is fluttering. According to the query related public information shows that the bird is supposed to be able to fly, and it is right to use flutter to describe the bird. Bird, also known as bird. Definition: an oviparous vertebrate with a feather-covered body, the main characteristics of a bird are: a streamlined (fusiform or pike-shaped) body and a mostly flying life. The body is covered with feathers and the forelimbs become wings (in some species the wings are reduced). Pectoral muscles are well developed. Rectum short, large food digestion fast, that is, the digestive system is well developed, which helps to reduce weight and facilitate flight.