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Bison are large, even-toed ungulates in the genus Bison within the subfamily Bovinae.
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, 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, found only in North America, is the most numerous. (It is only distantly related to the buffalo.) The North American species is composed of two s...