Habitat
Rock squirrels are nearly always found in rocky areas, cliffs, canyon walls, talus slopes, boulder piles, fills along highways, and so forth where they seek refuge and have their dens. Although typical ground squirrels in most respects, they can climb trees nearly as well as tree squirrels.

Description
A large, moderately bushy-tailed ground squirrel; upper parts mottled grayish brown, the hind back and rump more brownish (head or head and upper back blackish in some parts of the state); tail mixed buff and brown, edged with white; underparts buffy white or pinkish buff. Source: The Mammals of Texas - Online Edition Drs. William B. Davis & David J. Schmidly courtesy of Texas Tech University and the Texas Parks & Wildlife Dept.

Comments
See also Arizona gray squirrel