Lots of animals sleep for a very long time in winter—like frogs, bears, bees, ants and snakes!
In the fall, the bear eats lots of fruits and fish to last a long time. It makes a bed of leaves and twigs(树枝), then curls up in a ball and falls asleep. Its breathing(呼吸)becomes slow, and its heart beats a lot slower, too!
It won't eat, drink water, or go to the bathroom until spring. When it wakes up after winter sleep, it will be hungry. So it eats almost anything, like meat, wild berries, grass and fish.