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Bison occidentalis is an extinct species of bison that lived in North America, from about 13,000 to 1,730 years ago, spanning the end of the Pleistocene to the Holocene. Some authors consider Bison occidentalis to be an intermediate species between Bison antiquus and modern American bison (Bison bison), spanning from the Late Pleistocene-Early Holocene and including remains from central North America. However, as the type specimen of B. occidentalis is from Alaska, other authors have argued that the species should be restricted to remains from northwest North America (no further south than northern British Columbia), with suggestions that true B. occidentalis evolved locally in the region from steppe bison (Bison priscus) around 13,000 years ago.
