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The male grizzly bear's hibernation ends in early to mid-March, while females emerge in April or early May. [52] In preparation for winter, bears can gain approximately 180 kg (400 lb), during a period of hyperphagia, before going into hibernation. [53] The bear often waits for a substantial snowstorm before it enters its den: such behavior ...
Although naturally-made dens are occasionally used, most dens are dug out by the bear. [68] During their time in hibernation, an American black bear's heart rate drops from 40 to 50 beats per minute to 8 beats per minute, and the metabolic rate can drop to a quarter of the bear's (nonhibernating) basal metabolic rate. These reductions in ...
Hibernation. Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It is most commonly used to pass through winter months – called overwintering.
[109] [110] 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. [111] Bears normally do not wake during their hibernation, and can go the entire period without eating, drinking, urinating, or defecating. [47]
Polar bear. The polar bear (Ursus maritimus) is a large bear native to the Arctic and nearby areas. It is closely related to the brown bear, and the two species can interbreed. The polar bear is the largest extant species of bear and land carnivore, with adult males weighing 300–800 kg (660–1,760 lb). The species is sexually dimorphic, as ...
Individual bears vary in size seasonally, weighing the least in spring due to lack of foraging during hibernation, and the most in late fall, after a period of hyperphagia to put on additional weight to prepare for hibernation. [38] [39] Brown bear skeleton. Brown bears generally weigh 80 to 600 kg (180 to 1,320 lb), with males outweighing ...
Asian black bears are diurnal, though they become nocturnal near human habitations. They will walk in a procession of largest to smallest. They are good climbers of rocks and trees, and will climb to feed, rest, sun, elude enemies and hibernate. Some older bears may become too heavy to climb. [30]
Horsfield, 1826. Himalayan brown bear range. The Himalayan brown bear (Ursus arctos isabellinus), also known as the Himalayan red bear or isabelline bear, is a subspecies of the brown bear occurring in the western Himalayas. It is the largest mammal in the region, males reaching up to 2.2 m (7 ft 3 in) long, while females are a little smaller.