Hiberbation

Hiberbation Hibernation, state of reduced activity that occurs in some animals during the winter. In cold weather most animals must eat large quantities of food to obtain the energy needed to carry on normal body activities. In winter, however, food often becomes scarce, so many animals cannot survive unless they hibernate. A hibernating animal greatly reduces normal body activities that expend energy. It survives on energy reserves, such as fat, stored in the body. During hibernation, an animal lowers its metabolic rate—the rate at which an animal uses energy and stops generating the heat necessary to keep its body temperature above that of the environment. As body activities slow, the animal becomes less and less capable of coordinated movement, gradually slipping into a state of dormancy, or torpor. If, however, the animal's body temperature slips below a certain range, the animal will generate heat to boost body temperature to a safe range. Animals may hibernate for several months, but they do not remain completely inactive during this time. Hibernation typically occurs in bouts, or episodes, lasting from a few days to a few weeks depending upon the animal, body size, outside temperature, and time of year. These bouts of inactivity are interspersed with animals, body, hibernation, temperature, animal, rate, hibernating, mammals, heat, metabolic, energy, during, torpor, food, warm, fat, arouse, temperatures, less, internal, hibernate, bouts, animal's, time, stored, set, scientists, point, known, high, ground, fuel, few, drop, degrees, cold, changes, certain, bout, activities, active, state, squirrels, species, small, sleep, season, rhythm, reserves, relatively, periods