When do Bears Hibernate? - hibernation for kids

Generally bears enter hibernation in early October and emerge sometime in April or May.

Hibernating animals breathe much more slowly and their body temperature falls.
They also need much less food. 

They build up a thick layer of fat during the warmer months and use it up very slowly during hibernation.
For animals big as the bear it is extremely difficult to find enough food during the winter, and therefore they go into hibernation.
Yet in order to survive this long period of hibernation, the bears must previously build up their body weight by accumulating fat. 
Hibernation cycle is just another unique natural adaptation which allows the animals like the bear to survive during the severe winter time.

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