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Ursus arctos horribilis, better known as the grizzly bear, is distinguished by its humped shoulders, long claws and concave facial profile with heavy brow (think Winnie the Pooh). Bears did not used to be considered true hibernators, because other deep hibernating mammals typically go through a drastic decrease in body temperature, whereas a bear’s core temperature remains above 88ºF during hibernation (normal for a bear being ~100ºF). Whereas smaller mammals may experience core drops to as low as 40ºF. This enables the bear to more quickly awaken and react to threat. Easy to see why stumbling into a bear cave even in the dead of winter can have a dangerous outcome.

Ursus arctos horribilis, better known as the grizzly bear, is distinguished by its humped shoulders, long claws and concave facial profile with heavy brow (think Winnie the Pooh).

Bears did not used to be considered true hibernators, because other deep hibernating mammals typically go through a drastic decrease in body temperature, whereas a bear’s core temperature remains above 88ºF during hibernation (normal for a bear being ~100ºF). Whereas smaller mammals may experience core drops to as low as 40ºF. This enables the bear to more quickly awaken and react to threat. Easy to see why stumbling into a bear cave even in the dead of winter can have a dangerous outcome.

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