Brown Bear (ursus arctors) is a large bear across much of nothern eurasia and north america. Adult bears generally weigh between 100 and 635 kilograms and its largest species kodiak bear.These omnivorous giants tend to be solitary animals, except for females and their cubs, but at times they do congregate. Dramatic gatherings can be seen at prime Alaskan fishing spots when the salmon
Brown Bear Edit
Length: 5 to 8 ft (1.5 to 2.5 m)Edit
Weight: 700 lbs (318 kg)Edit
Average Life span in the wild: 25 years
swim upstream for summer spawning.
Taxonomy and EvolutionEdit
Brown bears are thought to have evolved from Ursus etruscus . The oldest fossils occur in Chinafrom about 0.5 million years ago. They entered Europe about 250,000 years ago, and North Africa shortly after. Brown bear remains from the Pleistocene period are common in the British isles where it is thought they outcompeted cave bears. The species entered Alaska 100,000 years ago, though they did not move south until 13,000 years ago. It is thought brown bears were unable to migrate south until the extinction of the much larger Arctodus simus. Several paleontologists suggest the possibility of two separate brown bear migrations: grizzlies are thought to stem from narrow-skulled bears which migrated from northern Siberia to central Alaska and the rest of the continent, while Kodiak bears descend from broad-skulled bears from Kamchatka, which colonized the Alaskan peninsula. Brown bear fossils discovered in Ontario, Ohio, Kentucky and Labrador show the species occurred farther east than indicated in historic records
Despite their Enourmous sizebrown bears are extremely fast, having been clocked at speeds of 30 miles per hour (48 kilometers per hour). They can be dangerous to humans, particularly if surprised or if a person gets between a mother bear and her cubs.