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adult animal appear areas aspen autumn bear attacks bear country bear mother bear's behavior berries biochemical biologist black bear habitat black bear population body breeding brown brown bears campground carnivore claws climb continent cover cubs deer dens Dian Fossey dumps ears energy estrus fall feeding feet female food availability food shortage forage forest garbage Gary grasses green-up Greg Wilker grizzly grizzly bears ground hibernation home ranges human hundred hunters hunting insects Kawishiwi Kawishiwi River killed kilocalories land litters Lynn Rogers males mast mating metabolic Minnesota Mountain move nest North America northeastern Minnesota northern nuisance nursing nuts Patch paws Pennsylvania percent pine Pleistocene poachers pounds predaceous production protein road season short-faced bear sniff species spring spruce square mile stand summer survival temperature territories trail tree urine Ursus usually vegetation walking wild wildlife Wilker winter sleep woods young