Some animals sleep all winter. It is a very deep sleep called hibernation. They need little or no food. Bears hibernate. So do frogs, snakes and even some bugs.
Other animals stay active in winter. It is hard for them to find food. They may live in holes in trees or under the ground to stay warm. Deer, squirrels and rabbits stay active.
Some birds fly south for the winter. We call this migration. They go to a warmer place to find food. Other birds stay here all winter. We can help by feeding them.