How did we go from more than 50 million wild bison to just 23 free-roaming animals? And how does the decimation of the herds relate to the oppression of Native Americans? Find out on this episode of Threshold.

Each season, Threshold podcast explores one story from the natural world, and what it says about us. Season one focuses on the American bison. Dig into the history of the American bison, from their arrival in North America, to current controversies surrounding their management today.