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Bears are prolific scavengers and kleptoparasites, stealing food caches from rodents, and carcasses from other predators. [55] [86] For hibernating species, weight gain is important as it provides nourishment during winter dormancy. A brown bear can eat 41 kg (90 lb) of food and gain 2–3 kg (4.4–6.6 lb) of fat a day prior to entering its ...
Grizzly bears also do not defecate or urinate throughout the entire hibernation period. The male grizzly bear's hibernation ends in early to mid-March, while females emerge in April or early May. [53] In preparation for winter, bears can gain approximately 180 kg (400 lb), during a period of hyperphagia, before going into hibernation. [54]
The American black bear (Ursus americanus), or simply black bear, is a species of medium-sized bear endemic to North America. It is the continent's smallest and most widely distributed bear species. It is an omnivore, with a diet varying greatly depending on season and location. It typically lives in largely forested areas but will leave ...
An adult bear will consume anywhere from 20,000 to 24,000 calories per day to prepare for hibernation. Tahoe bears will travel long distances to bulk up before winter. How to protect your home
The brown bear's winter fur is very thick and long, especially in northern subspecies, and can reach 11 to 12 cm (4.3 to 4.7 in) at the withers. The winter hairs are thin, yet rough to the touch. The summer fur is much shorter and sparser, with its length and density varying among geographic ranges. [49]
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The glacier bear female normally has her first litter by 3–5 years of age. This breeding period takes place in June through July. Gestation lasts 235 days and cubs are born in January to early February. [13] Because of the increasing range of all subspecies of black bears since the last glacier maximum, interbreeding is taking place.
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).