Pregnant females usually enter dens first, followed by females with young, subadults, and lastly, adult males Haroldson et al. Mammals considered true, or deep hibernators, such as chipmunks and ground squirrels, experience a drastic decrease in body temperature during hibernation. Bears will remain in the area of their den for a few weeks and enter a state of lethargy during which they eat nothing and sleep frequently Craighead and Craighead Major den excavation is completed in days during which a bear may move up to a ton of material Brown ; Craighead and Craighead Hibernation is an adaptation to a seasonal shortage of food, low environmental temperatures, and snow cover on the ground Craighead and Craighead ; Tietje and Ruff Actually, the plug, made up of feces, dead intestinal cells, hair, and bedding material, forms during hibernation and not before Rogers It is possible this plug may keep the bear from defecating inside the den during hibernation as fecal plugs are found just inside or outside the dens of bears that have just emerged Rogers Wildlife Society Bulletin
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