Silencing the Thunder (2014)

Every year hundreds of Yellowstone National Park bison are shot and aggressively chased by helicopters and ATVs back into the park to prevent disease transmission to domestic cattle herds in Montana. Bison advocates believe the disease brucellosis is the primary stumbling block to restoring America's last wild-bison population. Meanwhile, the ranching community believes the current management is the only way to protect their economic and cultural way of life from collapse. Silencing the thunder takes a deeper look into the controversial management of Yellowstone National Park bison and questions whether this iconic species should be lethally managed to control the spread of brucellosis.