Hibernation Bear
bears of northern regions, including american black bear , grizzly bear, hibernate in winter. during hibernation, bear s metabolism slows down, body temperature decreases slightly, , heart rate slows normal value of 55 9 beats per minute. bears not wake during hibernation, , can go entire period without eating, drinking, urinating, or defecating. fecal plug formed in colon, , expelled when bear wakes in spring. if have stored enough body fat, muscles remain in condition, , protein maintenance requirements met recycling waste urea. female bears give birth during hibernation period, , roused when doing so.
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