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Cave bears grew larger during glaciations and smaller during interglacials, probably to adjust heat loss rate. [20] Cave bears of the last Ice Age lacked the usual two or three premolars present in other bears; to compensate, the last molar is very elongated, with supplementary cusps. [21]
U. rossicus dental specimens when separated into groups of different ontogenetic stages do not show significant variations in microwear, suggesting the diets of these bears stayed fairly constant over the course of their lifetimes. [5] Cave bear teeth show greater wear than most modern bear species, suggesting a diet of tough materials.
Examinations on a mostly full sized young individual of Arctodus simus from an Ozark cave suggest that Arctodus, like other ursids, reached sexual maturity well before full maturity. Comparisons with black bears suggest the Arctodus specimen was either 4–6 years of age if female, or 6–8 years if the specimen was male.
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Winter is finally here, and bears are getting ready to find a den to hibernate in over the next few months. In Wyoming's Yellowstone National Park, one bear was caught prepping for his long sleep ...
Download as PDF; Printable version; ... Cave bear; Brown bear; References This page was last edited on 6 September 2024, at ...
[110] [111] During hibernation, the bear's metabolism slows down, its body temperature decreases slightly, and its heart rate slows from a normal value of 55 to just 9 beats per minute. [112] Bears normally do not wake during their hibernation, and can go the entire period without eating, drinking, urinating, or defecating. [47]
A grizzly bear at Maryland Zoo was captured on CCTV struggling to stay awake as hibernation season approaches. During their long winter sleep, the body temperature of a bear dips to about 30-35C ...