Bear Hibernation?

Hibernation lasts up to 7 months in the northern regions but is shorter in the South. Bears that find food year-round in the South may not hibernate at all. To survive long winters without eating, drinking, exercising, or passing wastes, hibernating bears cut their metabolic rates in half. Sleeping heart rate drops from a summer rate of between 60 and 90 beats per minute to a hibernating rate between 8 and 40 beats per minute. Rectal temperature drops only slightly, though, from 99-102 degrees F in the summer to 88-98 degrees F during hibernation. Bears can maintain this high body temperature despite their slower metabolism in winter because they develop highly insulative fur and reduce blood supplies to their limbs. Only the head and torso are maintained at the high temperatures. Maintaining the brain at a high temperature enables bears to maintain brain function for tending newborn cubs and responding to danger.

You should do a search on http://www.wikipedia.com/ and also check out Discovery channel's website and Animal planet's they would have the best and most accurate information. Also be specific type in "bear's hibernation" and make sure that you put it in " " because that will narrow your search. Best of luck to you.