Asiatic black bears are more carnivorous than their American counterparts, although only a small part of their diet is made up of meat. The metabolic rate of a hibernating bear will remain at a reduced level for up to 21 days after hibernation. In aggressive interactions, black bears produce deep-throated pulsing sounds. The giant panda is a rare, endangered and elusive bear. Mammalogists have placed giant pandas with bears family Ursidae , with raccoons Procyonidae , or with the red, or lesser, panda Ailurus fulgens in Ailuridae. The polar bear digs a den in the snow, whereas grizzlies build large mounds of dirt in front of their dens. Gestation periods vary, the fertilized egg remaining dormant in the uterus delayed implantation , which ensures the birth of young while the female is in the winter den and guarantees that the cubs will emerge from the den in the spring, when food is abundant. Bears have an elongate skull that is especially heavy in the back portion, and their jaws are controlled at the hinge by a powerful set of muscles. Sloth bears are stocky with long, shaggy, black hair and a white U- or Y-shaped marking on the chest.
Credits- text- various sources. However, molecular analyses performed during the s have revealed a close evolutionary relationship between giant pandas and bears. Species of Ursinae have migrated repeatedly into North America from Eurasia as early as 4 Mya during the early Pliocene. Males reach full size at about 8 years of age. Black bears live up to 25 years in the wild. These shaggy-haired bears can be heard sucking up termites a long distance away. Gestation periods vary, the fertilized egg remaining dormant in the uterus delayed implantation , which ensures the birth of young while the female is in the winter den and guarantees that the cubs will emerge from the den in the spring, when food is abundant. Once the hive is breached, black bears will scrape the honeycombs together with their paws and eat them, regardless of stings from the bees. Adult female bears are smaller and average around kg lbs ; their peak weights do not usually exceed kg lbs. The feet generally have hairless soles, but those of the polar bear are covered with hair, enabling the animal to walk on ice with a firm footing. They can be active at any time of the day or night. Females also give birth in February and nurture their cubs until the snow melts. However, at abundant food sources i. Their diet is mostly vegetable matter. Unlike other bears, giant pandas do not hibernate. The constant availability of ants and termites also mean that they do not need to undergo a winter sleep. Bears, however, lack the physiological characteristics lower heart rate, body temperature, breathing rate, and blood pressure exhibited by animals that truly hibernate. These animals looked very different from today's bears, being small and raccoon-like in overall appearance, with diets perhaps more similar to that of a badger. Auto collisions also may claim many black bear lives annually. The Andean bear is the last remaining short-faced bear subfamily Tremarctinae and the closest living relative to the Florida spectacled bear and short-faced bears of the Middle Pleistocene to Late Pleistocene age. They have large lips, a long tongue, a pale muzzle and well-developed hook-like claws that enable them to climb trees and dig for termites. Black bears are now considered highly efficient hibernators. Studies of mitochondrial DNA mtDNA performed during the early 21st century showed that black bears, brown bears, and polar bears diverged from one another some 4 million—5 million years ago, early in the Pliocene Epoch 5. Some species depredate livestock on occasion, and some ursids, such as Asiatic and American black bears, may destroy fruit or other crops, especially corn. It is likely ancestral to all bears within Ursinae, perhaps aside from the sloth bear.
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