What are the hibernating animals? There used to be frogs in the pond, ladybugs in the leaves, snakes in the holes, squirrels in the trees, bears in the holes and so on.

Hibernation is a state in which the extreme but regular decline of body temperature, metabolism and other physiological activities is an adaptation to reducing energy consumption. Hibernating species can be roughly divided into active hibernating animals and passive hibernating animals. The latter, such as hamster, external factors, including photoperiod, food and external temperature, play a major role in the timing of this hibernation cycle event.