The Natural History of Ursus Arctos

Physical description: Ursus Arctos (or brown bear) is the largest and most powerful among terreratory carnivores. Leg height when upright is 3 to 5 feet (91 to 153 cm) and 6 to 9 feet (183 to 274 cm). The brown bear's average weight depends on the sex and the possibility of obtaining a stable source of that food. The average male brown bear is about 550 lb (247 kg) on ​​average and women average about 157 kg (350 lb). But brown bears who live along the coast and can eat a protein-rich diet can weigh up to 680 kilograms (1500 pounds).

In the bear, natural mating between Grizzly Bear (Ursus arctos) and Polar Bear (Ursus maritimus) leads to Hybrid descendant Park 6. A brown bear and polar bear genome scale study found that 8.8% of the individual brown bear genome has the origin of polar bear 7. In addition, the brown bear mitochondrial (mt) genome was captured by polar bears during ancient breeding 8 polar bear alleles were distributed throughout the world brown bear population through male bias and gene flow 7, 9, 10

S'eek (black bear) and Xóots (brown bear): If you spend a long time learning about bears, you immediately notice that Ursus americanus (American black bear) and Ursus arctos (different) brown or grizzly bear are in each other It will be the same. Perhaps most surprisingly, the majority of people killed in bear attacks are killed by brown bears. Therefore, there is no doubt that each of these highly unique species has its own unique name in Tlingit-s'eek for black bear and Brown's xóots. Using these names in southeastern Alaska will help highlight these important differences.

Men always talk about bears. The oldest prehistoric cave paintings depict dance bear and devil bear, bear and human bear. Because the difference between Homo sapiens and Ursus arctos is not completely clear, this kind of confusion is natural, and sometimes it seems to be a simple pose problem. In fact, the difference between bears is quite obvious, a smart wise person who spent centuriesly exploring and simulating the simplest bear's skills (exploration, fishing, feeding, caving) and imitating it. According to one theory people and bears arrive more or less in Alaska and cross the huge overpasses that used to connect Asia and North America. Before the Bering Sea covered the bridge 40,000 years ago, the brown bear was in the mainland. Some people are believed to be trapped in the Arctic ice sheet and evolve into polar bears.