Each season, Threshold explores one story from the natural world, and what it says about us. Season one focuses on the American bison.

When you start out talking about bison, you end up talking about America. Wherever you are in the U.S., bison used to live there too. How did that change so drastically, so quickly? Can the U.S. ever have wild, free-roaming bison again? Should we? Threshold podcast dives deep into the history of the American bison to understand who we are, where we've been, and where we're going.