Do birds hibernate?

Hibernation is a state when animals sleep during winter, especially where the winters are extremely cold and/or snowy. Not all animals hibernate. Animals such as bears, squirrels, bats, and hedgehogs hibernate. Some lizards and snakes hibernate.

When these animals hibernate, they will eat a lot of food and gain body weight beforehand to enable them to sleep throughout the winter. For example, squirrels can gain 50% of their body weight before hibernating.