With 2,075 records, the bighorn sheep is one of the most thoroughly documented mammals in South Dakota’s atlas, and the map shows two strongholds. Badlands National Park alone accounts for 1,437 records, while the Black Hills cluster of Custer State Park, Black Hills National Forest, and Jewel Cave National Monument holds most of the rest.
Built for broken country
Bighorns live on steep, rugged ground where few predators can follow, using split hooves with rough, grippy soles to hold on rock and exceptional eyesight to spot danger across open slopes. They graze grasses and browse shrubs on the benches and ridges below that escape terrain, which is exactly the mix the Badlands wall and the granite country of the Black Hills provide.
Brought back from absence
Bighorns disappeared from South Dakota in the early twentieth century under pressure from unregulated hunting and disease carried by domestic sheep, and every herd in the state today descends from reintroductions into the Badlands and Black Hills. The herds are visible year-round, records peak from May through September, and the late-autumn rut, when rams crash horns over access to ewes, makes the big males conspicuous in November.
Status in South Dakota
NatureServe ranks the bighorn sheep S4, Apparently Secure, in South Dakota, and the species is native to the state. USGS NAS does not list it as nonindigenous here.
Full species profile
