Black wildebeest
Where it lives alongside the blue wildebeest, the two species can hybridise, and this is regarded as a potential threat to the maintenance of the species. The black wildebeest was once very numerous and was present in Southern Africa in vast herds, but by the end of the 19th century, it had nearly been hunted to extinction and fewer than 600 animals remained. A small number of individuals was still present in game reserves and at zoos, and from these, the population was rescued.
Popo Agie Wilderness
Over 300 lakes and several tributaries of the Wind River are located in the wilderness. Rare reports of wolves have been documented and are considered to be from the wolf recovery efforts commenced in the late 20th century in Yellowstone National Park to the north. Additionally, reports of grizzly bears have been documented but they too are rare. Black bears, moose, elk, and pronghorn are the more commonly sighted megafauna. Trumpeter swans, bald eagles, hawks, and falcons inhabit the wilderness, especially near lakes and streams. Eight species and subspecies of trout, including a few found only in the Yellowstone region exist as well. The forest is dominated by lodgepole pine and Douglas fir, Engelmann Spruce, and subalpine fir at higher elevations up to the tree line.