National Geographic : 2016 May
A bison raised on the Flying D ranch near Bozeman, Montana, is put down after showing possible signs of brucellosis, a serious disease transmissible to cattle. Whether Yellowstone’s wild bison pose a similar threat is a matter of heated controversy. PHOTO: DAVID GUTTENFELDER A century after Yellowstone rescued the species, bison are a living compromise, sort of thriving in the sort-of wild. They multiply freely, and with predators preferring to target elk, their population outpaces the park’s ability to sustain them. Once they step beyond its borders, they are regarded by many ranchers asmoreofapestthana paragon of the American West. Each year hundreds are culled by park and state authorities and Native American tribes.