Harris Antelope Squirrel (Ammospermophilus harrisii), Sonoran Desert, Arizona. These squirrels are easily seen scampering over rocky slopes in arid canyons and scurrying through brushy growth on broad, sandy plains. They are true ground squirrels, living in burrows that they dig themselves. The Antelope Squirrel commonly sits perfectly erect upon its hind feet. When disturbed, it runs with its tail straight up in the air and utters chipperings as it hurries to a nearby burrow. Harris Antelope Squirrels are normally solitary animals and only come together to mate. Range: southwest United States and northwest Mexico.