The Pryor Mountains
East Pryor Mountain (elevation 8,822 ft) dominates the horizon. In the foreground is Yellowtail Reservoir, in the Big Horn River Canyon. Pompeys Pillar is about 60 miles to the right (north-northeast) of this photo.
Close-up of the East Pryor Mountain.
The foothills of the Pryors in a rosy winter sunrise.
n the south slopes of East Pryor Mountain roams a herd of 159 (as of March 2002), wild horses. Dozens of herds, actually — mature stallions with their mares and colts, and young ones hanging out with their peers, all following spring greenup from the foothills to the high ridges and meadows, or retreating from winter’s winds into the deep draws of the badlands along the Bighorn River. It is of course impossible to say whether any of those mustangs are descendants of the horses taken from Nathaniel Pryor back in July of 1806.1
The Crows--if that’s who took them--could not have had any reason to keep them separate from the rest of their horses. Besides, the animals Pryor was responsible for originally had been purchased cheap by the Corps of Discovery from Shoshone, Nez Perce, and lower Columbia River Indians.
In any case, DNA evidence indicates that, like all the other feral horses in the Western United States, the Pryor Mountain horses are descendants of Spanish Barbs2 brought to the Americas as early as 1493. Sometime after the beginning of the 18th century, Plains Indians acquired Spanish horses through trade, or by culling them out of stray herds.
The fenced, 38,000-acre Pryor Mountain Wild Horse Range, established in 1968, was the first of three federal "special status areas" for feral horses. The other two ranges, designated in the Wild Free-roaming Horses and Burros Act of 1971, are located on the Nellis Air Force Base in Nevada and near Grand Junction, Colorado. All three are administered by the U.S. Department of the Interior's Bureau of Land Management. In addition, the BLM oversees 209 other “herd management areas” covering about 35 million acres of public land in Arizona, California, Colorado, Idaho, Montana, Nevada, Oregon and Utah, and containing an estimated 46,000 feral horses.3
To maintain healthy ranges, which in many places are shared with cattle, the BLM makes some wild horses available for adoption every year, so there are now privately-owned herds in many other states. Also, herds of somewhat smaller wild horses have survived on several islands off the East Coast of the U.S., including about 150 animals on Assateague Island, in Virginia and Maryland, which have been there for perhaps three hundred years.
Only once are wild horses mentioned in the journals of Lewis and Clark. On July 5, 1806, having recently crossed the "east fork of Clark's river" at today's Missoula, Montana, Lewis remarked: "there are many wild horses on Clarkes river. About the place we passed it we saw some of them at a distance. There are said to be many of them about the head of the yellowstone river."
1. The scientific name for the domestic horse is Equus caballus, The name of the genus, equus, is Latin for "horse"; the name of the species, caballus,fera, meaning "wild animal"; mustang is from the American Spanish word mestengo, meaning "stray animal."
2. The population figure for feral horses cited above includes wild burros. National Audubon Society Field Guide to North American Mammals (Rev. ed., New Yorik: Knopf, 1996), 810–813.