Question

What is hibernation?

Answer 1

Hibernation is one of the main adaptations that allow certain northern animals to survive long, cold winters.

Hibernation is like a very deep sleep that allows animals to save their energy when there is little or no food available.

Hibernation is a state of inactivity and metabolic depression in animals , characterized by lower body temperature, slower breathing, and/or lower metabolic rate.
The body functions of ‘true hibernators’
go through several changes while they are hibernating. Body temperature drops, and the heart rate slows.
Hibernating animals have a special substance in the blood called hibernation
inducement trigger, or HIT.

Eg. Bear, woodchunk etc.
I hope this helps :)