Yellowstone's population of bison are free-ranging, and so can leave the friendly confines of the park at any time. Animal activists believe that the bison, perhaps THE symbol of the plains, should be able to roam free as in centuries past. Ranchers in the area fear that their cattle may be infected by the brucellosis that bison can carry. As a result, a battle rages between the laissez-faire and regulatory camps, with the bison and government caught in the middle. This episode of TERRA takes an unblinking, Wiseman-inspired look at "The Bison Haze: A Yellowstone Controversy".