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However, in current times, American black bear fatalities are overwhelmingly attributable to human activities. These reductions in metabolic rate and heart rate do not appear to decrease the bear's ability to heal injuries during hibernation. The bear was able to reach the truck and tore one of the doors off the truck before Hoshino was able to drive off. Polar bears have been observed to hunt the small Svalbard reindeer R. The earliest recorded birth of polar bears in captivity was on 11 October in the Toronto Zoo. Once a deer fawn is captured, it is frequently torn apart alive while feeding. In some areas, the polar bear's diet is supplemented by walrus calves and by the carcasses of dead adult walruses or whales, whose blubber is readily devoured even when rotten. Females also give birth in February and nurture their cubs until the snow melts. Unlike brown bears, black bears frequently lose against wolves in disputes over kills. Their keenest sense is the sense of smell, which is about seven times greater than a dog's. In the den, she enters a dormant state similar to hibernation.
As the fawns reach 10 days of age, they can outmaneuver the bears and their scent is soon ignored until the next year. This behaviour, if it happens, is rare — although the story exists in the oral history of northern peoples and in accounts by early Arctic explorers , there is no record of an eyewitness account of the behaviour in recent decades. Ringed seals are born weighing 5. These reductions in metabolic rate and heart rate do not appear to decrease the bear's ability to heal injuries during hibernation. Seals migrate in response to these changes, and polar bears must follow their prey. Although stereotyped as being voraciously aggressive, they are normally cautious in confrontations, and often choose to escape rather than fight. However, in current times, American black bear fatalities are overwhelmingly attributable to human activities. As a result, the cats spend more time killing and less time feeding on each kill. The male's ornamental foreleg hair is thought to attract females, serving a similar function to the lion's mane. In Labrador , black bears are exceptionally carnivorous, living largely off caribou , usually sickly, young or dead specimens, and rodents such as voles. Polar bears consume a wide variety of other wild foods, including muskox Ovibos moschatus , reindeer Rangifer tarandus ,  birds, eggs, rodents , crabs , other crustaceans and other polar bears. The bear's bone mass does not change in geometry or mineral composition during hibernation, which implies that the bear's conservation of bone mass during hibernation is due to a biological mechanism. Phipps in , and Ursus maritimus marinus by Peter Simon Pallas in The polar bear kills the seal by biting its head to crush its skull. Although naturally-made dens are occasionally used, most dens are dug out by the bear itself. Black bears are now considered highly efficient hibernators. They were also diving to feed on blue mussels and other underwater food sources like the green sea urchin. Bears living near human habitations tend to be more extensively nocturnal , and bears living near brown bears tend to be more extensively diurnal. Ursus maritimus tyrannus became extinct during the Pleistocene. Due to the absence of human development in its remote habitat, it retains more of its original range than any other extant carnivore. For example, large furry feet and short, sharp, stocky claws give them good traction on ice. These include refuse , birdseed , agricultural products and honey from apiaries. However, at abundant food sources i. Despite the black bear being more powerful on a one-to-one basis, packs of wolves have been recorded to kill black bears on numerous occasions without eating them. Like brown bears, they will sometimes steal kills from cougars. Females communicate with their young with moans and chuffs, and the distress calls of both cubs and subadults consists of bleats.
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