6. Bison
- The largest land animal on the continent, bison stand up to six-feet-high at the shoulder and weigh upwards of 1.5 tons. And they’re not just big; a bison can run up to 40 miles-an-hour over short distances, and jump fences, so an angry buffalo with two sharp horns on its head is a force of nature that almost nothing short of a high-velocity rifle round can stop.