Restricted to the Cascade Mountains of Washington State and British Columbia, Cascade golden-mantled Ground Squirrels are so similar to golden-mantled Ground Squirrels that some scientists consider them the same species. However, their ranges are separated by the Columbia River. Learn more about the Spermophilus saturatus, more commonly known as a Cascade Golden-mantled Ground Squirrel, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.