Allen's chipmunks live in mature forests and spend a lot of their time in the trees, but search for food on the forest floor. Females are larger than males, and the chipmunks that live in coastal redwood forests are larger than the ones that live inland. Learn more about the Tamias senex, more commonly known as an Allen's Chipmunk, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.