Yellow-tailed chipmunks are common in California's dark, moist giant redwood forests. These relatively large chipmunks are hard to see but they can be recognized by a unique call given when intruders are present. Learn more about the Tamias ochrogenys, more commonly known as a Yellow-cheeked Chipmunk, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.