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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 ...
Bats hibernating in a silver mine. 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.
Polar bear feeding on a seal on an ice floe north of Svalbard, Norway. It is the most carnivorous species. The sloth bear is not as specialized as polar bears and the panda, has lost several front teeth usually seen in bears, and developed a long, suctioning tongue to feed on the ants, termites, and other burrowing insects
The American black bear (Ursus americanus), also known as the 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.
Arctic National NWR. The Arctic National Wildlife Refuge (ANWR, pronounced as “ ANN-warr ”) or Arctic Refuge is a national wildlife refuge in northeastern Alaska, United States, on traditional Iñupiaq and Gwich'in lands. The refuge is 19,286,722 acres (78,050.59 km 2) of the Alaska North Slope region, with a northern coastline and vast ...
Mother bears and their cubs have not had any difficulties hibernating, wildlife officials said. Half-asleep bears — unable to hibernate — seen walking around in Russia, officials say Skip to ...
The short-story "Bathybia" by Douglas Mawson, published in the book Aurora Australis in 1909, deals with an expedition to the South Pole where the team encounters giant mushrooms and arthropods, and a four-foot-long tardigrade waking from hibernation; this scares the narrator from his sleep, and he realizes it was all a dream. [114]
Polar bears differ from black bears, grizzlies, and other bear species where both sexes hibernate in that only females use hibernacula. Like other female bears, polar bears use hibernacula as maternity dens. Also like other species, they tend to dig dens into the earth, although their Arctic hibernacula are usually covered with snow by the time ...
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