The brown bear (Ursus arctos) is a species of bear distributed throughout the Northern hemisphere. Weighing up to 130–700 kg (290-1,500 pounds), the larger races of brown bear tie with the Polar bear as the largest extant land carnivores. The grizzly bear (Ursus arctos horribilis), the Kodiak Bear (Ursus arctos middendorffi), and the Mexican brown bear are North American subspecies of the brown bear. However, DNA analysis has recently revealed that the identified subspecies of brown bears, both Eurasian and North American, are genetically quite homogeneous, and that their genetic phylogeography does not correspond to their traditional taxonomy.
Brown Bears have furry coats in shades of blonde, brown, black, or a combination of those colors. The longer outer guard hairs of the brown bear are often tipped with white or silver, giving a "grizzled" appearance. They have a very short, stubby tail, just like all bears in the world. Brown bears have a large hump of muscle over their shoulders, which give strength to the forelimbs for digging. Bears are very powerful; even if considered pound for pound, a large specimen can break a neck or spine of a fully grown buffalo with a single blow. Forearms end in massive paws with very powerful claws up to 15 cm (5.9 inches) in length. Their heads are large and round with a concave facial profile. The normal range of physical dimensions for a brown bear is a head-and-body length of 1.7 to 2.8 m (5.6 to 9.2 feet) and a shoulder height 90 to 150 cm (35 to 59 inches), although the abnormally large specimens exceed these measurements. The smallest subspecies is the European brown bear, with mature females weighing as little as 90 kg (200 lb). The largest subspecies of the brown bear are the Kodiak bear and the bears from coastal Russia and Alaska. It is not unusual for large male Kodiak Bears to stand over 3 m (10 feet) while on their hind legs and to weigh about 680 kg (1,500 lb). Bears raised in zoos are often heavier than wild bears because of regular (sometimes excessive) feeding and limited movement. In zoos, bears may weigh up to 900 kilograms (2000 pounds), like the well-known "Goliath" from New Jersey's Space Farms Zoo and Museum. According to the Great Bear Almanac, one of the well known books about bears, the largest Kodiak bear weighed close to 2400 pounds.
In spite of their size, some have been clocked at speeds in excess of 56 km/h (35 mph). Along with their strength and deceptive speed, brown bears are legendary for their stamina. They are capable of running at full speed for miles at a time without stopping....(more on www.wikipedia.com)