CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY
Female Harris's Antelope Squirrel (Ammospermophilus harrisii). 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 never found abundantly; they are solitary animals that come together for mating. They are found in the SW United States and NW Mexico. Sonoran Desert, Az.
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