Bison antiquus , sometimes called the `` ancient bison '' , was the most common large herbivore of the North American continent for over 10,000 years , and is a direct ancestor of the living American bison .
Bison antiquus , sometimes called the `` ancient bison '' , was the most common large herbivore that lived in North America during the Pleistocene for over ten thousand years , and is a direct ancestor of the living American bison .