A native North American tree squirrel species characterized by its silvery-gray fur and arboreal lifestyle, found predominantly in western United States forests and woodlands.
Coniferous and mixed forest ecosystems in California, Oregon, Washington, and parts of Nevada, preferring mature forests with dense canopy cover and abundant oak and pine trees
Key seed dispersal agent, forest ecosystem maintenance, prey for predators like hawks and bobcats, contributes to forest regeneration through seed caching and tree nut distribution
