American bison = "the largest land mammal in North America". (One wonders about the qualifier "land". Are there, like, Giant Squids living in Lake Superior?)
The little map shows the original range of the American bison, from up near Alaska, east to the Appalachians, down south to near the Caribbean coast and then around down into what is now northern Mexico. Remarkable.
(The GIF is an Eadweard Muybridge motion study, c. 1887,
For more animated GIFS, see flux machine. My favorite is "Bruges". Splat!