The rock squirrel is a large ground squirrel that is 17-21 inches in length. It is mottled gray on its uppersides with a brownish rump and creamy white on its undersides. It has a long bushy tail with white edges.
The rock squirrel can be found in rocky habitats. It can be found on cliffs, canyon walls, talus slopes, rock and boulder piles and highway fills. It is often seen sitting on or running on rocks. It usually makes its den in a burrow below the rocks, but it may make a den in a tree hollow. The rock squirrel can be found in southern Nevada, Utah, Colorado, Arizona, New Mexico, western Texas and the panhandle of Oklahoma.