阅读理解，按要求做答。

    Everybody has a home. Animals also have their homes. People live in many different kinds of houses. Animals have different kinds of houses, too. Some animals live in holes under the ground. Woodchuck lives under the ground. Its home has two doors. If any enemy comes in through one door. The woodchuck will go out through the other one. Some animals live in holes or in trees.Squirrels build their nests high in the trees.Birds also live in holes or in trees. And most of them live in their nests. Only hawks build their nests high in the mountains.