Members of the genus Bison are large even-toed ungulates within the subfamily Bovinae. Two extant and four extinct species are recognized. The surviving species are the American bison, also known as the American buffalo (although it is not related to the true buffalo), Bison bison (with two subspecies, the plains bison, Bison bison bison, and the wood bison, Bison bison athabascae), found in North America, and the European bison, or wisent (Bison bonasus), found in Europe and the Caucasus. While these species are usually grouped into their own genus, they are sometimes included in the closely related genus Bos, together with cattle, gaur, kouprey and yaks, with which bison have a limited ability to interbreed.
The American bison and the European wisent are the largest terrestrial animals in North America and Europe. Bison are nomadic grazers and travel in herds, except for the non-dominant bulls, which travel alone or in small groups during most of the year. American bison are known for living in the Great Plains. Both species were hunted close to extinction during the 19th and 20th centuries but have since rebounded. The American Plains bison is no longer listed as endangered, but the Wood Bison is on the endangered species list in Canada.
Although superficially similar, there are a number of physical and behavioural differences between the American and European bison. The American species has 15 ribs, while the European bison has 14. The American bison has four lumbar vertebrae, while the European has five. Adult American bison are not as rangy in build, and have shorter legs. American bison tend to graze more, and browse less than their European cousins. Their anatomies reflect this behavioural difference; the American bison's head hangs closer to the earth than the European's. The body of the American bison is typically hairier, though its tail has less hair than that of the European bison. The horns of the European bison point through the plane of their faces, making them more adept at fighting through the interlocking of horns in the same manner as domestic cattle, unlike the American bison which favours butting. American bison are more easily tamed than their European cousins, and breed with domestic cattle more readily.
A 2003 study found that mitochondrial DNA indicated that four distinct maternal lineages in tribe Bovini: 1. taurine cattle and zebu, 2. wisent, 3. American bison and yak, and 4. banteng, gaur, and gayal. However, Y chromosome analysis associated wisent and American bison. An earlier study using amplified fragment length polymorphism (AFLP) fingerprinting showed a close association of wisent and American bison and probably with yak but noted that the interbreeding of Bovini species made determining relationships problematic.
During the population bottleneck, American bison were interbred with domestic cattle. Accidental crossings were also known to occur. Generally male domestic bulls were crossed with buffalo cows producing offspring of which only the females were fertile. Genetic analysis has found a high degree of intermixture in modern commercial bison herds. Some cattle breeds are also partly bison, for instance, Beefalo. Wisent-American bison hybrids were briefly experimented with in Germany (and found to be fully fertile) and a herd of such animals is maintained in Russia. A herd of cattle-wisent crossbreeds (Zubron) are maintained in Poland. First-generation crosses do not occur naturally, requiring caesarean delivery. First-generation males are infertile.
Wallowing is a common behavior of bison. A bison wallow is a shallow depression in the soil, either wet or dry. Bison roll in these depressions, covering themselves with mud or dust. Possible explanations suggested for wallowing behavior include grooming behavior associated with moulting, male-male interaction (typically rutting behavior), social behavior for group cohesion, play behavior, relief from skin irritation due to biting insects, reduction of ectoparasite load (ticks and lice), and thermoregulation. In the process of wallowing bison may become infected by the fatal disease anthrax, which may occur naturally in the soil.
The bison's temperament is often unpredictable. They usually appear peaceful, unconcerned, even lazy, yet they may attack anything, often without warning or apparent reason. They can move at speeds of up to thirty-five miles per hour and cover long distances at a lumbering gallop.
Their most obvious weapons are the horns borne by both males and females. But their massive heads can be used as battering rams, effectively using the momentum produced by two thousand pounds moving at thirty miles per hour. The hind legs can also be used to kill or maim with devastating effect. At the time bison ran wild, they were rated second only to the Alaska brown bear as a potential killer, more dangerous than the grizzly bear. In the words of early naturalists, they were a dangerous, savage animal that feared no other animal and in prime condition could best any foe.
The rutting, or mating, season lasts from June through September with peak activity in July and August. At this time, the older bulls rejoin the herd and fights often take place between bulls. The herd exhibits much restlessness during breeding season. The animals are belligerent, unpredictable and most dangerous.
Bison have a fairly simple diet. The bison's main food is grass. Bison also eat the low lying shrubbery that is available. In the winter, bison forage in the snow looking for grass. If there is little grass available, bison have to resort to eating the twigs of shrubs.
Due to their large size few predators attack bison. However, wolf packs can take down a bison. There are even documented cases of a single wolf taking down bison (Schmidt & Mech, 1997). Brown bears will also prey on calves, and have been observed driving off wolves to take over their kills.
Dried buffalo meat at Finney County Historical Museum in Garden City, Kansas
An American Bison standing its ground against a gray wolf pack
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- ^ "Wallowing Behavior of American Bison (Bos Bison)". JSTOR. April 10, 2008. http://www.jstor.org/pss/3083019.
- ^ "Anthrax kills bison in southern N.W.T.". CBC.CA. July 8, 2006. http://www.cbc.ca/canada/north/story/2006/07/06/anthrax-nwt-bison.html.
- ^ a b c "American Bison". http://www.nps.gov/archive/wica/Bison.htm.