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Usually during winter, it is quite cold and the food is scarce. Hence, in order to survive during winter, many animals snuggle up in burrows, caves, tree trunks, etc. and remain inactive as if they are in a deep sleep. This state of inactivity is called hibernation and the animals which hibernate such as bears, bats, groundhogs, ground squirrels, etc. are called hibernators.
Now, during hibernation, many changes take place in their bodies. For example, their heartbeat and breathing rate slow down. Their body temperature goes way down.
Also, many animals don't even eat or drink. Instead, they eat a lot before hibernating and store the food in their bodies in the form of fat. Then, while hibernating, the hibernators use the stored fat to keep themselves alive in the winter. Depending on the species, some of them might not even urinate or defecate for days or weeks. Then, when winter is over and the climate is favorable, the hibernators wake up and perform their regular activities.

Timecodes :
0:00 - How do Animals Hibernate?
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