Winter sleep is called as
Hibernation
The correct option is B.
Explanation of correct option:
Explanation of incorrect option:
Option A:
Aestivation or "summer sleep" is the low metabolic process performed by animals during summers.
Option C:
Migration is the movement of animals from one region to another in search of food.
Option D:
Adaptation is the process by which an organism becomes fitted better in its habitat.
Final answer: Winter Sleep is called Hibernation.