Question

What causes some animal to hibernate?

Answer 1

Hibernation is the animal's way of adaptation in order to be able conserve energy by staying inactive and lowering its physical activity in preparation for future purposes say for example a bad weather.  Other animals also hibernate in preparation for a long drought or scarcity of food. They tend to consume a lot of food before the scarce and will use the accumulated energy during the drought when there will be no more food to eat. It is a way of recharging themselves.