The Tule Elk is endemic to California. It is the smallest subspecies of North American Elk - Cervus elaphus nannodes. The other two subspecies, also found in California, are Roosevelt Elk (Cervus elaphus roosevelti) and Rocky Mountain Elk (Cervus elaphus nelsoni).
In the early 1800's Tule Elk were quite abundant in the Bay area but were driven to local extinction by the 1870's. They were gradually reintroduced into the Mt. Hamilton region between 1978 and 1981 resulting in herds getting established in Isabel Valley, San Antonio Valley, San Felipe, Metcalf Canyon, Coyote Ridge, Anderson Reservoir and surrounding areas. The elk's recovery from local extinction is a remarkable success story.