https://www.bear.org/website/bear-pages/black-bear/hibernation/20-digging-a-den.html
When biologists discovered the many metabolic changes that let black and grizzly bears hibernate up to 7 ½ months without eating, drinking, urinating, or defecating, they realized that body temperature was only a small part of hibernation. ...Black bears are now considered highly efficient hibernators.
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