American bison

The American bison (Bison bison; pl.: bison), commonly known as the American buffalo, or simply buffalo (not to be confused with true buffalo), is a species of bison that is endemic to North America. It is one of two extant species of bison, along with the European bison. Its historical range circa 9000 BC is referred to as the great bison belt, a tract of rich grassland spanning from Alaska south to the Gulf of Mexico, and east to the Atlantic Seaboard (nearly to the Atlantic tidewater in some areas), as far north as New York, south to Georgia, and according to some sources, further south to northern Florida, with sightings in North Carolina near Buffalo Ford on the Catawba River as late as 1750.

Two subspecies or ecotypes have been described: the plains bison (B. b. bison), smaller and with a more rounded hump; and the wood bison (B. b. athabascae), the larger of the two and having a taller, square hump. There has been a proposal to divide the plains bison into subspecies of northern (B. b. montanae) and southern (B. b. bison), but this proposal has limited scientific support. The wood bison is one of the largest wild species of extant bovid in the world, surpassed only by the Asian gaur. With wild animals weighing up to 1,270 kg (2,800 lb), the bison is among the heaviest extant land animals in North America and the heaviest herbivore.