Ursus americanus
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Physical description:
Height varies. On all fours, black bears may stand anywhere from 3 to 4 feet. When standing upright on their hind legs, they may reach a height of 4 to 7 feet. Body length varies with age and sex, but commonly 50 to 80 inches from nose to tail Weight also varies with age, sex, and season. Males can range from 125-500 pounds. The heaviest male ever recorded tipped the scales at 880 pounds! Females generally range 90-300 pounds. The record weight for a female black bear is 520 pounds. Captive bears often exceed the typical weight of the species because of their constant and abundant food supply. The black bear has several variations in its coloring. Black and brown is the most common color, however blonde is occasionally seen, and in British Columbia, there is even a white subspecies. |
Special anatomical, physiological or behavioral
adaptations:
Bears are excellent climbers and will take to the trees as a means of escape, to reach food, or simply to relax. One bear has been observed making its den 96 feet above the ground in a tree! Bears are also excellent swimmers. They will swim without hesitation and are notorious for swimming to island campsites in search of food. On land the bear is also a swift runner, far faster than a human. Many people are fooled by the bear’s bulk and perceive it to be a slow runner. A lean bear can run in excess of 30 m.p.h. and can run uphill without losing speed. In winter, however they are considerably slower due to the excess weight gained for hibernation and winter survival. In winter they often tire quickly during a chase. In places where the winter climate is cold and snowy, bears, as mentioned, will hibernate. The hibernation period varies with location and available food supply and ranges from a few weeks to seven months. During this period the bear does not urinate or defecate, which has led to research on how the bear disposes of toxins during this long “sleep.” It is hoped that this research will aid in future kidney treatments. Bears are thought to have color vision, and possess a very acute sense of smell. |
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Page author: J. Nathan Davis
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