Snake River Plains Ground Squirrel (Urocitellus idahoensis) lives in sagebrush grasslands across Northwestern North America. Its conservation status is Least Concern.
Fascinating facts about the Snake River Plains Ground Squirrel
- The Snake River Plains ground squirrel lives only in Idaho, with its entire distribution situated north of the east-west flowing Snake River, which marks the southern edge of its range. This river therefore serves as a clear biogeographic barrier separating it from the closely related Piute ground squirrel to the south.
- Originally thought to be a subspecies of the Piute ground squirrel, it was elevated to full species status in 2025 after genetic analysis revealed distinct differences. Integrative taxonomic analysis of multilocus nuclear DNA provided decisive support for its recognition as a distinct species.
- Genetic studies show a deep split between the northern U. idahoensis and southern U. mollis populations, so much so that the two lineages are not even sister taxa.
- The Snake River Plains ground squirrel occupies a total area of roughly 29,700 km², a range that stretches across 22 counties in Idaho. Although the species is endemic to the state and lives north of the east-west flowing Snake River, it does not fill this space uniformly. Instead, it is found only in isolated sagebrush-steppe pockets, giving its distribution a distinctly patchy character within the broader landscape.
- As an obligate heterotherm, the Snake River Plains ground squirrel undergoes a deep winter hibernation and a summer estivation, a seasonal rhythm it shares with its small-eared Urocitellus relatives. This physiological strategy allows it to cope with the extreme temperature swings of its arid desert environment. The squirrel's small-to-medium body size and fossorial lifestyle further support its ability to retreat underground during these dormant periods.
Sources
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At a glance
RangeNorthwestern North America
HabitatSagebrush grasslands
DietGrass and seeds
About the Snake River Plains Ground Squirrel
Across the sun-baked expanse of the Snake River Plains, a diminutive yet resilient figure emerges, as the ground squirrel darts with nimble precision, its tawny coat glistening like burnished gold in the bright sunlight. With an air of quiet industry, it burrows and forages, its paws barely disturbing the dry earth as it weaves a intricate network of tunnels and dens, a hidden world of remarkable complexity. As it pauses to survey its surroundings, its large, dark eyes shine with a piercing intensity, a testament to the resourceful spirit of this unassuming, yet captivating, creature.
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