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Just in case anyone is interested in such things:
Bears do not hibernate in the sense that other mammals may hibernate. Some biologists prefer to call it sleeping. Yes,...it has some characteristics similar to true hibernation as exhibited by rodents and bats, but it differs in other ways. I'll list some these similarities and diffs (may not be an exhaustive list), but the most prominent/obvious is that they may wake up and leave the den from time to time. in some areas where food remains obtainable, bears may not hibernate at all. also, if they have been unable to gorge & put on weight they will hibernate less or not at all.
Similarities: sleep for extended periods of time lose weight (however, loses a greater percentage due to higher sleeping metabolism) don't eat don't urinate or defecate
Differences: bear's body temp. does not drop to within a few deg. of the ambient air temp metabolic rate is comparatively high (true hibernators have very low heart and respiratory rates) - hence it loses wt & is able to give birth & care for cubs they are somewhat aware of their surroundings & changes to it - may attack intruders (so, unlike rodents & bats, don't attempt to handle/touch them during "hibernation") they wake up, move about in the den, and may leave the den for short periods of time groom/lick/clean themselves curl up to conserve body heat give birth & nurse their young & keep them warm and groomed/clean
Edited by pj on 08/21/2005 03:38:33 MDT.
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