Mammals diurnal

Harris' Antelope Squirrel

Ammospermophilus harrisii

A resilient desert specialist, Harris' Antelope Squirrel is one of the few mammals you'll see darting through the Sonoran heat. Recognized by its striking side-stripes and expressive tail, it is a master of survival in the most arid environments.

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Quick Identification

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Size

Total length 22–25 cm (8.7–9.8 in); tail length 7–9 cm (2.8–3.5 in); weight 113–150 g (4.0–5.3 oz)

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Colors

Grizzled gray and brownish upper body with a single, crisp white stripe on each side. The tail is mixed black and gray, significantly darker on the underside compared to its relatives.

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Key Features

Single white stripe on each flank
Gray or blackish underside of the tail
Small, rounded ears and white eye-ring
Often carries tail arched forward over the back

When You’ll See Them

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Activity pattern diurnal

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Peak hours 8 AM - 11 AM and 3 PM - 6 PM; stays active during midday even in high summer.

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Season Year-round; most visible during spring breeding and late summer cactus fruiting.

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Diet An opportunistic omnivore that eats seeds, cactus fruit (saguaro and prickly pear), green vegetation, insects, and occasionally small lizards or carrion.

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Habitat Arid lowlands, rocky hillsides, and desert scrub, frequently extending into desert-landscaped suburban backyards.

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Behavior

Harris' Antelope Squirrels are the marathon runners of the desert. Unlike most desert dwellers that retreat to deep burrows during the hottest parts of the day, these squirrels are frequently active in extreme temperatures. They have evolved a physiological strategy known as 'heat dumping,' where they lie flat against cool, shaded soil or rocks to transfer body heat back into the earth, allowing them to forage longer than their competitors.

These rodents are predominantly solitary and highly alert. When threatened, they emit a high-pitched, bird-like trill or whistle to warn others. They are ground-dwellers by nature, often found scurrying between creosote bushes or cactus patches with their tails held in a characteristic arch over their backs, which some researchers believe helps provide a small amount of shade for their bodies.

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Camera Tips

To capture the best footage of Harris' Antelope Squirrels, place your camera very low to the ground, ideally 6 to 10 inches high. These are small animals, and a high-mounted camera will only capture their backs. Aim the lens at a 'stage'—a flat rock or a clear patch of sand near the base of a creosote bush or a prickly pear cactus where they likely forage for fallen fruit.

Because they are active in the intense desert sun, lighting can be a challenge. Try to position your camera facing North or South to avoid the direct East-West sun glare that can wash out the details of their white stripes. If your camera has a 'high' sensitivity setting for the PIR sensor, use it; these squirrels are small and move incredibly fast, sometimes failing to trigger slower sensors until they are already out of frame.

In the arid Southwest, water is the ultimate lure. A shallow, low-profile water dish placed in the frame will almost guarantee a visit. Not only will they drink, but they may pause long enough for a high-quality video clip. For the best action shots, set your camera to a short video mode (10-15 seconds) rather than just stills, as their 'heat dumping' and tail-flicking behaviors are much more interesting to see in motion.

During the peak of summer, be careful with camera placement. Dark-colored trail camera housings can absorb enough heat in direct desert sun to damage internal batteries or electronics. Use a security box or tuck the camera under the northern canopy of a desert tree or bush to keep the equipment cool and the image quality crisp, as heat waves rising off the ground can cause blurry 'mirage' effects in your footage.

Similar Species

Species that look similar or are commonly confused with Harris' Antelope Squirrel.

White-tailed Antelope Squirrel

Look for a bright white underside of the tail; Harris' tail is dark gray or black underneath.

Round-tailed Ground Squirrel

Lacks the white side stripes and has a much longer, thinner, pencil-like tail.

Frequently Asked Questions

They are diurnal, meaning they are active during the day. Unlike many desert animals, they remain active even during the hottest midday hours, though their peak activity usually occurs in the mid-morning and late afternoon.

The most effective way to attract them is by providing a reliable water source, such as a ground-level birdbath. Planting native desert flora like prickly pear or saguaro also provides natural food sources they find irresistible.

They have a varied diet consisting of seeds, mesquite beans, and cactus fruit. They are also opportunistic and will eat insects like grasshoppers, as well as small vertebrates or carrion if available.

Yes, they are very common in suburban developments within the Sonoran Desert, particularly in yards that utilize 'xeriscaping' or natural desert landscaping rather than grass lawns.

The easiest way is to look at the tail. Harris' has a dark, grizzled gray/black underside to its tail, whereas the White-tailed Antelope Squirrel has a bright, solid white underside that is very conspicuous when held over its back.

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