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There are two extant and four extinct species recognized. Of the four extinct species, three were North American; Bison antiquus, B. latifrons, and B. occidentalis. The fourth; the Bison priscus ranged across steppe environments from Western Europe, through Central Asia, and onto North America.
There are two surviving species; the American bison, Bison bison, also known as the American buffalo, found only in North America, is the most numerous. (It is only distantly related to the true buffalo.) The North American species is composed of two subspecies, the plains bison, Bison bison bison, and the wood bison, Bison bison athabascae. The European bison Bison bonasus, or wisent is found in Europe and the Caucasus, re-introduced after being extinct in the wild.
While all bison 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 good swimmers and can cross rivers over half a mile (1 km) wide. Bison are nomadic grazers and travel in herds. The bulls leave the herds of females at 2 or 3 years of age, and join a male herd which is generally smaller than the female herds. Mature bulls rarely travel alone. Towards the end of the summer, for the reproductive season, the sexes necessarily commingle. 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. (The difference in this case is that what would be the first lumbar vertebra in wisent has ribs attached to it in American bison and is thus counted as the 15th thoracic vertebra, compared to 14 thoracic vertebrae in wisent.) Adult American bison are less slim 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 lower 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.
Evolution and genetic history
The bovine family (Taurids and Bisonids) diverged from the common ancestral line with Water Buffalo and African Buffalo about 5 to 10 million years ago. Thereafter, the family lineage of bison and taurine cattle does not appear to be a straight forward ‘tree’ structure as is often depicted in much evolution, because there is evidence of interbreeding and crossbreeding between different species and members within this family, even many millions of years after their ancestors separated into different species. This cross breeding was not sufficient to conflate the different species back together, but it has resulted in unexpected relationships between many members of this group, such as Yak being related to American Bison, when such relationships would otherwise not be apparent.
A 2003 study of mitochondrial DNA indicated four distinct maternal lineages in tribe Bovini:
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.
The Steppe Bison (Bison priscus) diverged from the lineage that led to cattle (Bos taurus) approximately 2 to 5 million years ago. The Bison genus is clearly in the fossil record by 2 million years ago. The Steppe Bison spread across Eurasia and was the bison that was pictured in the ancient cave drawings of Spain and Southern France
The European Bison or Wisent arose from the Steppe Bison, without fossil evidence of other ancestral species between the Steppe Bison and the European Bison, though the European Bison might have arisen from the lineage that led to American Bison if that lineage backcrossed with the Steppe Bison. Again, the web of relationships is confusing, but there is some evidence that the European Bison is descended from bison that had migrated from Asia to North America, and then back to Europe, where they crossbred with existing Steppe Bison.
At one point, some Steppe Bison cross bred with the ancestors of the modern Yak. After that cross breeding, a population of Steppe Bison (Bison priscus) crossed the Bering Land Bridge to North America. There is evidence of multiple crossings of bison to and from Asia starting before 500,000 years ago and continuing until at least 220,000 years ago. The Steppe Bison spread through the northern parts of North America and Steppe Bison lived in Eurasia until approximately 11,000 years ago and North America until 4,000 to 8,000 years ago.
Bison latifrons (Giant Bison or Longhorn Bison) is thought to have evolved in midcontinent North America from Bison priscus, after the Steppe Bison crossed into North America. Giant Bison (Bison latifrons) appeared in the fossil record approximately 500,000 years ago. B. latifrons was one of many species of North American megafauna which became extinct during the transition from the Pleistocene to the Holocene epoch (an event referred to as the Quaternary extinction event). It is thought to have disappeared some 21,000–30,000 years ago, during the late Wisconsin glaciation.
The Bison latifrons (Giant Bison or Longhorn Bison) species was replaced by the smaller Bison antiquus. Bison antiquus appeared in the North American Fossil record approximately 250,000 years ago. Bison antiquus in turn evolved into the Bison occidentalis, then into the yet smaller Bison bison — the modern American bison — some 5,000 to 10,000 years ago. Some researchers consider Bison occidentalis to be a sub-species of Bison antiquus
During the population bottleneck, after the great slaughter of American Bison during the 1800s, the number of bison remaining alive in North America declined to as low as 541. During that period, a handful of ranchers gathered remnants of the existing herds to save the species from extinction. These ranchers bred some of the bison with cattle in an effort to produce "cattleo" (today called "beefalo") 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. The crossbred animals did not demonstrate any form of hybrid vigor, so the practice was abandoned. The proportion of cattle DNA that has been measured in introgressed individuals and bison herds today is typically quite low, ranging from 0.56 to 1.8%. In the United States, many ranchers are now utilizing DNA testing to cull the residual cattle genetics from their bison herds. The U.S. National Bison Association has adopted a code of ethics which prohibits its members from deliberately crossbreeding bison with any other species.
Some cattle breeds are intentionally bred with bison to produce, for instance, Beefalo hybrids. 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 all the time. A herd of cattle-wisent crossbreeds (Zubron) is 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 35 mph (56 km/h) 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 2,000 pounds (900 kg) moving at 30 mph (50 km/h). 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 (except for wolves and brown bears).
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.
The American bison live in river valleys, and on prairies and plains. Typical habitat is open or semi-open grasslands, as well as sagebrush, semi-arid lands and scrublands. Some lightly wooded areas are also known historically to have supported bison. Bison will also graze in hilly or mountainous areas where the slopes are not steep. Though not particularly known as high altitude animals, bison in the Yellowstone Park Bison Herd are frequently found at elevations above 8,000 feet and the Henry Mountains Bison Herd is found on the plains around the Henry Mountains, Utah, as well as in mountain valleys of the Henry Mountains to an altitude of 10,000 feet.
European bison (Wisent) tend to live in lightly wooded to fully wooded areas and areas with increased shrubs and bushes, though they can also live on grasslands and plains.
Throughout most of their historical range free-ranging bison are not tolerated by landowners or state governments. Herds on private land must be fenced in. In the United States state of Montana, free-ranging bison on public land may be shot; citing concerns of spreading disease and damage to public property. Legislation surrounding the bison continue to be proposed and vetoed by the governor of Montana; which remains a contested issue amongst Native American tribes and the American government.
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Bison are herbivores and eat simple foods. The bison's main foodstuff is grass, though they will eat any available low-lying shrubbery Citation needed as well as sedges. In the winter, bison forage for grass under the snow. If there is little grass available, they will eat the twigs of shrubs. Bison are notably better browsers than cattle, since cattle are more obligate grazers, even though wood bison have also been described as "obligate grazers". Wisent tend to browse on shrubs and low hanging trees more often than do their cousins, the American bison. American bison prefer grass to shrubbery and trees. Citation needed
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Due to their size, bison have few predators. Five notable exceptions are the Grey wolf, Human, Brown bear, Coyote, and Grizzly bear. The Grey wolf generally takes down a bison while in a pack, but there have been cases of a single wolf killing bison. Brown bear also prey on bison calves, often by driving off the pack and consuming the wolves' kill.
Infections and illness
For the American bison, the main cause of illness in bison is malignant catarrhal fever (MCF).; but the Yellowstone Park Bison Herd are noted to also get infected with Brucellosis. Bison in the Antelope Island Bison Herd are regularly inoculated against brucellosis, parasites, clostridium, infectious bovine rhino tracheitis and bovine vibriosis.
The European Bison's major concerns for illness are foot-and-mouth disease and balanoposthitis; which affects the male sex organs; and number of parasitic diseases, but cases of tuberculosis have been reported. The inbreeding of the species caused by the small population plays a role in a number of genetic defects and immunity to diseases; which poses greater risks to the population.
The term "buffalo" is sometimes considered to be a misnomer for this animal, as it is only distantly related to either of the two "true buffalo", the Asian water buffalo and the African buffalo. However, "bison" is a Greek word meaning ox-like animal, while "buffalo" originated with the French fur trappers who called these massive beasts bœufs, meaning ox or bullock—so both names, "bison" and "buffalo", have a similar meaning. Though the name "Bison" might be considered to be more scientifically correct, as a result of standard usage the name "Buffalo" is also considered correct and is listed in many dictionaries as an acceptable name for American Buffalo or bison. In reference to this animal, the term "buffalo", dates to 1635 in North American usage when the term was first recorded for the American mammal. It thus has a much longer history than the term "bison", which was first recorded in 1774.
The extinction of four species of bison (Bison antiquus, Bison latifrons, Bison occidentalis, and Bison priscus) is not tied to human behavior in any way, but is instead linked to natural selection. Humans were, however, almost exclusively accountable for the near-extinction of the American bison in the 1800s. At the beginning of the 19th century, tens of millions of bison roamed North America. Humans slaughtered an estimated 50 million bison, generally for their meat or pelts. This practice of over-hunting the bison reduced their population to mere hundreds. Attempts to revive the American bison, however, have been highly successful; farming of Bison bison has increased their population to nearly 150,000. The American bison is, therefore, no longer considered an Endangered species. 
In America, the commercial industry for bison has been slow to develop despite individuals like Ted Turner, who have long marketed bison meat. In the 1990's, Turner found limited success with restaurants for high qualify cuts of meat which include bison steaks and tenderloin. Lower quality cuts suitable for hamburger and hot dogs have been described as "almost non-existent". This created a marketing problem for commercial farming because the majority of usable meat, about 400 pounds for each bison, are suitable for these products. In 2003, the United States Department of Agriculture purchased of $10 million worth of frozen overstock to save the industry which would later recover through better use of marketing to consumers. Restaurants have played a role in popularizing bison meat like Ted's Montana Grill and other restaurants which added bison to their menus, such as Ruby Tuesday, which first served bison on their menus in 2005.
In Canada, commercial bison farming began in the mid 1980s, concerning an unknown number of animals at that time. The first census of the bison occurred in 1996; which recorded 45,235 bison on 745 farms and would grow to 195,728 bison on 1,898 farms for the 2006 census.
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