The Tukudeka or Mountain Sheepeaters are a band of Shoshone within the Eastern Shoshone and the Northern Shoshone. Before the reservation era, they traditionally lived in the central Sawtooth Range of Idaho and the mountains of what is now northwest Wyoming. Bands were very fluid and nomadic, and they often interacted with and intermarried other bands of Shoshone. Today the Tukudeka are enrolled in the federally recognized Shoshone-Bannock Tribes of the Fort Hall Reservation of Idaho and the Eastern Shoshone of the Wind River Indian Reservation in Wyoming.

Eastern Shoshone are Shoshone who primarily live in Wyoming and in the northeast corner of the Great Basin where Utah, Idaho and Wyoming meet and are in the Great Basin classification of Indigenous People. They lived in the Rocky Mountains during the 1805 Lewis and Clark Expedition and adopted Plains horse culture in contrast to Western Shoshone that maintained a Great Basin culture.