Bird is an animal with a spine axis. Is a common feature. £ blooded animals produce an egg. Changes to the front wing and tail feathers and hollow bones gently.
The bird is a Chordate characteristics a typical two-footed animal. Candy is a warm-blooded egg rayang double page changes to the wing. The bones are hollow and are feather light.
There are spinal cord axis, birds, animals, there is a general appearance is a bilateral animal blood warm Bath. It is a partner, egg รยางค์ page changes to Wing feathers, and there is a hollow bones that light