The California Vole occurs throughout much of California and southwestern Oregon, with disjunct subspecies in the Mojave Desert, the White Mountain/Panamint ranges, and northern Baja California. California Voles construct surface runways and extensive underground burrows, and are active throughout the year, chiefly at dawn and dusk. Learn more about the Microtus californicus, more commonly known as a California Vole, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.