The Plains bison (Bison bison bison) or is one of two subspecies/ecotypes of the American bison, the other being the wood bison (Bison bison athabascae). Furthermore, it has been suggested that the Plains bison consists of a northern (Bison bison montanae) and a southern subspecies, bringing the total to three. However, this is generally not supported. There is a surviving natural population of Plains bison in Yellowstone National Park (the Yellowstone Park Bison Herd consisting of...