Uinta Ground Squirrel (Urocitellus armatus) lives in alpine meadows across Western North America. It feeds on grass and seeds. Its conservation status is Least Concern.
Fascinating facts about the Uinta Ground Squirrel
- Measuring just 28 to 30 cm long, the Uinta ground squirrel packs a surprising heft: about 210 g when it first emerges from hibernation, swelling to as much as 635 g in adult males before they retreat underground for winter. Its body length ranges from 280 to 303 mm, and males typically weigh around 300 g at emergence, while yearling females can be as light as 201 g. This size range shows how quickly they bulk up to store energy for the long eight-month hibernation.
- Females sprint into estrus just two to four days after waking from hibernation, but only for a single afternoon each year. After a brief 23-to-26-day gestation, they give birth to an average of five pups, with litters ranging from four to six. The newborns weigh roughly 60 g, are weaned at about 22 days, and become independent within two to three weeks.
- Uinta ground squirrels chatter with six distinct calls, chirps, squeals, squawks, trills, growls, and teeth-clattering, to warn each other of danger. A male chirp lasts 0.08 seconds, slightly longer than the female's 0.06-second version, and both sexes use chirps for aerial predators while trills signal ground threats. The churr call travels farther than the chirp, letting distant squirrels hear an alarm.
- Adults burst from their burrows in mid-March, with males often leading the charge, and stay active for only about 3.5 months, from mid-April through early September, before retreating to hibernate for the remaining 8.5 months. They are strictly diurnal, feeding intensely in the first three hours after sunrise and again before sunset.
- The Uinta ground squirrel occupies a surprisingly narrow slice of the western United States, only from southwestern Montana through eastern Idaho, western Wyoming, and northern to central Utah, confined to open meadows, pastures, and shrub-steppe between 1,219 and 2,440 m elevation. The Green River canyon blocks eastward spread into Colorado, while the Snake River limits northward movement.
Sources
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At a glance
RangeWestern North America
HabitatAlpine meadows
DietGrass and seeds
About the Uinta Ground Squirrel
In the sun-baked expanses of the American West, the Uinta Ground Squirrel emerges as a whirlwind of industrious energy, its tawny fur fluffed against the chill of mountain mornings as it darts with purposeful haste across the rocky terrain. With each nimble bound, it seems to embody the very essence of its native landscape, a tiny but unyielding spirit that weaves in and out of the sagebrush and boulders with an air of quiet confidence. As it pauses to survey its surroundings, its bright, inquisitive eyes shine like dark jewels, illuminating a world of hidden wonders in this high-altitude realm.
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