Birds

Birds are not like mammals.

First, they all have feathers. The feathers are very light. They come in many colors and sizes. Each bird has special feathers. The feathers keep them warm. Some of them help the bird to fly.

Birds do not have babies that are born alive. They lay eggs. The eggs have hard shells. Birds lay eggs in their nests. They sit on them to keep them warm. For example, the father ostrich sits on the eggs and makes sure they are warm. When they are ready, they hatch. Baby birds come out of the shells.

Some birds have feathers, but they cannot fly. The ostrich cannot fly, but it can run fast.

Birds are a different kind of animal. They are not like a mammal or a fish. They are like themselves!