The Last Wild Bison Herd

In the early eighteen eighties, professional hunters working the northern Plains were killing bison faster than the animals could reproduce. Buffalo robes sold in eastern markets. Bones were ground for fertilizer. The federal government did nothing to stop the slaughter; General Philip Sheridan argued publicly that destroying the bison was the most efficient means of eliminating the economic base of the Plains peoples who depended on them. By eighteen eighty-nine, the species that had numbered an estimated sixty million animals was functionally extinct across its former range.

In Yellowstone, a small group survived. Roughly twenty-three animals hidden in the Pelican Valley backcountry, in terrain too remote for the hunters and too protected, barely, by the park's boundaries. Congress had passed a law against killing park wildlife in eighteen ninety-four, partially in response to documented bison poaching. The Pelican Valley survivors became the seed population.

The herd you see in Hayden Valley today, five thousand animals moving across a former lake bottom, grazing the same grassland their ancestors used, is descended directly from those twenty-three. They are among the only continuously wild, free-roaming bison herds in North America with no history of cattle crossbreeding, a short list that also includes small herds like Wind Cave and Elk Island. Most other bison populations in the United States have passed through private ranch operations and carry some domestic cattle genetics. The Yellowstone herd does not. They are the genetic remnant of sixty million animals, preserved by accident and geography in the one corner of the continent that the hunters could not reach in time.

The Yellowstone River meanders through Hayden Valley at road level. Stop at any pullout in the early morning and you will see what the Great Plains looked like before the eighteen seventies. Briefly, and only here.