Visit the American Prairie Reserve, a conservation project in the heart of Montana that could eventually be home to 10,000 bison. The vision is to stitch together 3.5 million acres of public and private lands to form the largest wildlife park in the lower 48. But some nearby ranchers feel the push to build the APR is pushing them off their land, and they're mounting a resistance. We also try to solve the Great Elk Mystery: why are elk that have been exposed to brucellosis allowed to roam free in Montana, while bison are not?

"We have fallen heirs to the most glorious heritage a people ever received, and each one must do his part if we wish to show that the nation is worthy of its good fortune."

~ Theodore Roosevelt

In 1908, the National Bison Range was created by carving 18,000 acres out of Montana's Flathead Reservation. Now, the U.S. Fish and Wildlife Service says it is willing to transfer the land back to the Confederated Salish and Kootenai Tribes. But, a lawsuit has been filed to stop the proposed transfer. In this episode we meet tribal members who feel they are the rightful stewards of the land and the historic bison herd, and others who are trying to stop the transfer.

Lennae Klyap of Dome Mountain Ranch talks about what happened when a lone bison bull migrated onto the ranch's property north of Yellowstone.

In episode four of Threshold, we meet Robbie Magnan of the Fort Peck Tribes. He believes his community can prosper in the future by reconnecting with their roots as the Tatanka Oyate — the buffalo people. Magnan has built a quarantine facility that could be an alternative to the Yellowstone bison slaughter, but right now it sits empty while more than a thousand bison are being culled from the herd. Why? We'll learn more about Magnan's vision for bison restoration, and investigate why some people are opposed to it.

Humans first encountered bison more than 75,000 years ago, as we migrated north out of Africa. We retrace that journey across Europe and Asia, and into the Americas.

Yellowstone Park Superintendent Dan Wenk gives his take on the bison conundrum.

Many cattle ranchers view wild bison as a threat to their livelihoods. But some think cattle and bison can coexist. On episode three of Threshold, you'll meet two cattle ranchers with different perspectives on wild bison — and, we'll take you on a controversial bison hunt.

A Yellowstone visitor tries to explain how it feels to watch the country's largest wild bison herd grazing in the Lamar Valley.

Amy goes off-trail in the Yellowstone snow and discovers how hard it is to be a bison.

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.