Bison's a taxonomic group containing six species of large even-toed ungulates within the subfamily Bovinae. Two of these species still exist: the American plains bison (B. bison bison), and the American wood bison (B. bison athabascae) are subspecies found in North America and the European bison, or wisent (B. bonasus), found in Europe and the Caucasus. Description The American bison and the wisent are the largest terrestrial mammals in North America and Europe. Bison are nomadic grazers and… (More on Bison)