Write characteristics of Aves.
Some of the characteristics of aves are given below: (A) A feather covered body is present which is divided into head, neck and tail . (B) Bipedal birds at present. For flight the forelimbs are modified into wings. (C) Teeths are not present and the mouth is surrounded by a beak. (D) The long bones are hollow and contain the ear cavity so the skeleton is light. (E) Air sacs are present in lungs by which respiration occurs. (F) Four chambered hearts are present.
