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Bison
Genus of bovines

This article is about the animal. For other uses, see Bison (disambiguation).
Bison are large bovines in the genus Bison within the tribe Bovini. Two extant species and numerous extinct species are recognised.

Quick Facts Scientific classification, Type species ...
Of the two surviving species, the American bison, B. bison, found only in North America, is the more numerous. Although colloquially referred to as a buffalo in the United States and Canada, it is only distantly related to the true buffalo. The North American species is composed of two subspecies, the Plains bison, B. b. bison, and the wood bison, B. b. athabascae, which is the namesake of Wood Buffalo National Park in Canada. A third subspecies, the eastern bison (B. b. pennsylvanicus) is no longer considered a valid taxon, being a junior synonym of B. b. bison. References to "woods bison" or "wood bison" from the eastern United States refer to this subspecies, not B. b. athabascae, which was not found in the region. The European bison, B. bonasus, or wisent, or zubr, or colloquially European buffalo, is found in Europe and the Caucasus, reintroduced after being extinct in the wild.

While bison species have been traditionally classified in their own genus, modern genetics indicates that they are nested within the genus Bos, which includes, among others, cattle, yaks and gaur, being most closely related to yaks. Bison are sometimes bred with domestic cattle and produce offspring called beefalo or zubron.

Description

Magdalenian bison on plaque, 17,000–9,000 BC, Bédeilhac grottoe, Ariège
The American bison and the European bison (wisent) are the largest surviving terrestrial animals in North America and Europe. They are typical artiodactyl (cloven hooved) ungulates, and are similar in appearance to other bovines such as cattle and true buffalo. They are broad and muscular with shaggy coats of long hair. Adults grow up to 2 metres (6 feet 7 inches) in height and 3.5 m (11 ft 6 in) in length for American bison and up to 2.1 m (6 ft 11 in) in height and 2.9 m (9 ft 6 in) in length for European bison. American bison can weigh from around 400 to 1,270 kilograms (880 to 2,800 pounds) and European bison can weigh from 800 to 1,000 kg (1,800 to 2,200 lb). European bison tend to be taller than American bison.

Bison are nomadic grazers and travel in herds. The bulls leave the herds of females at two or three years of age, and join a herd of males, which are generally smaller than female herds. Mature bulls rarely travel alone. Towards the end of the summer, for the reproductive season, the sexes necessarily commingle.

Evolution and genetic history
The bovine tribe (Bovini) split about 5 to 10 million years ago into the buffalos (Bubalus and Syncerus) and a group leading to bison and taurine cattle. Genetic evidence from nuclear DNA indicates that the closest living relatives of bison are yaks, with bison being nested within the genus Bos, rendering Bos without including bison paraphyletic. The mitochondrial DNA of European bison is more closely related to that of domestic cattle and aurochs, which is either suggested to be the result of incomplete lineage sorting or ancient introgression. Bison are widely believed to have evolved from a lineage belonging to the extinct genus Leptobos during the Late Pliocene to Early Pleistocene in Asia. The earliest members of the bison lineage, known from the Late Pliocene to Early Pleistocene of the Indian Subcontinent (Bison sivalensis) and China (Bison palaeosinensis), approximately 3.4-2.6 million years ago (Ma) are placed in the subgenus Bison (Eobison). The oldest remains of Eobison in Europe are those Bison georgicus found in Dmanisi, Georgia, dated to around 1.76 Ma. More derived members of the genus are placed in the subgenus Bison (Bison), which first appeared towards the end of the Early Pleistocene, around 1.2 Ma, with early members of the subgenus including the widespread Bison schoetensacki.

Note : this video is created with computer

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