Overview | How Bison are Saving America's Lost Prairie | Season 1 | Episode 7 | PBS

The prairie landscape has come to symbolize the American heartland. But an ecosystem that once covered a vast swath of the continent has all but disappeared. Just a tiny fraction remains. But researchers and conservationists in Oklahoma may have hit upon two surprising keys to saving this lost ecosystem: bison and fire. Their efforts could help restore degraded grasslands around the world.