If that tangle means "Why do animals hibernate?", it is a defence against the cold and food shortages of Winter. A few animals, such as bats, will wake in milder spells from time to time to forage for food.
Animal hibernation is triggered by changes in environmental factors such as temperature and food availability. The decrease in daylight and temperature signals to animals that it is time to conserve energy by entering hibernation. Hormonal changes also play a role in regulating hibernation.
helps animal to survive
When in hibernation, an animal would rest(sleep) in it's habitat until it is spring. Once in hibernation, the animal's heart rate slows down. That way, the animal can save more fat to be warm during the cold winters night.
Animals such as wolves, need food for reproduction,energy,nutrients, and they need it for hibernation(if your animal hibernates). Let me know if this helped you.
there are too hot in their place, they don't need to hibernation
It drops during hibernation
Hibernation
An animal hibernates to withstand the scarcity of food and coldness.By hibernating,they need only less energy for their body work and can survive in the toughest condition.This is an adaptation of animals.
really it depends what type of animal. for example, some will come out of the last hibernation and start eating to pack on weight straight away
Butt
Hibernation is a behavioral adaptation. A behavioral adaptation is when a animal changes its behavior.
hibernation is important for animal 1 they don't get cranky like some humans do.2 so animal don't have wonder about outside life and the snow/sleet during the winter.3 so animal walk around fat stuffed with food and water.