ABOUT AMERICAN BISON
Bison can be traced back to the Ice Age. Back then they were called Steppe bison, and they ranged over major parts of northern Europe, Asia, and North America. They were, for the most part, larger than today’s bison; mostly to prevent heat loss.
There was little difference between the Steppe bison of Europe/Asia and the bison of North America, but by today’s standards, they were huge. Males had horn spreads reaching more than 6 feet and were as much as 40% larger than today. Also, the vertebral spines in the hump were much longer.