Whether you call them bison or buffalo, you should clarify by putting North American in front of either word. Not only will this make clear that you are not referring to the true buffalo of Africa or Asia, but will distinguish your reference from the European bison. Called a wisent, the European bison (Bison bonasus) are close relatives of the American bison. They have been depicted in ancient cave art at such famous sites as Lascaux in France. The largest living herds are found in Poland's Bialowieza National Park, where Europe's last remaining primeval forest exists.