Bison are six species of large even-toed ungulates within the subfamily bovinae. Two of these species still exist: the American plains bison (Bison bison bison), and the American wood bison (Bison bison athabascae) are subspecies found in North America and the European bison, or wisent (Bison bonasus), found in Europe and the Caucasus. All the species normally form their own genus, also called Bison, but they are sometimes included in the closely related genus Bos, together with domestic cattle, with which bison can interbreed.


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