Based on the study of the external structure of the bird, note the features associated with flight.

The bird has many adaptations that it needs to fly. First of all, it is the presence of wings. Some birds flap their wings constantly to stay in flight, and some can glide in the air. It all depends on the structure of the wings and the size of the bird. Also, birds have feathers. They are necessary for the flight. Some birds lose their ability to fly when they change feathers. The body shape of the birds is also important. There are no extra organs in their structure and everything is simplified as much as possible for the implementation of the flight.