How 60 Million Bison Became 1,000 in a Century

In the late 1700s, more than 60 million bison roamed the Great Plains. Over the years, demand for fur and meat drove their numbers down

from Travel | Smithsonian http://www.smithsonianmag.com/videos/category/history/how-60-million-bison-became-1000-in-a-century/