The term 'American Ox, Wild' refers to two species of large, hoofed mammals native to North America: the American BUFFALO (BISON bison) and the American BISON (BISON bison). Both species are commonly referred to as 'BUFFALO' or 'BISON' and are found in grasslands, prairies, and woodlands across the continent. The American BUFFALO is the larger of the two species, with males weighing up to 2, 000 pounds, while the American BISON is smaller, with males weighing up to 1, 000 pounds. Both species are considered to be keystone species, playing a vital role in maintaining healthy ecosystems.