Bears Biological Clock
Name: Charles F.
When exactly do bears hibernate? Is there a certain
temperature? When snow falls?.
It depends on the species of bear, area and climate in which the bear lives,
and even individual differences between animals. In general bears (and other
hibernating mammals) enter hibernation at some point where food supplies
dwindle to the point they can no longer accumulate fat and weather has
cooled so that the animal expends more energy than it takes in.
See also this previous answer to a related question:
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Update: June 2012