Yellowstone National Park holds the last continuously wild bison herd in the United States, and each year hundreds of those animals are shot or chased out of the park by helicopters and ATVs. The film lays out why: fear that brucellosis, a disease bison can carry, might spread from the herd to Montana's domestic cattle. Ranchers defend the culls as the only reliable way to protect a livelihood and a way of life built around cattle. Bison advocates counter with vaccination programs and reproductive controls, arguing these could cut the death toll without risking cattle herds, and they push back on a management plan they say could eventually push the species toward extinction rather than recovery. The film puts both sides on record without settling the argument for them, tracking the tension between a disease-control policy and a symbol of the American West that nearly disappeared once already. The core question it leaves open: what does responsible management of a wild species look like when public health, agriculture, and conservation all pull in different directions?