Merriam's chipmunk's calls are distinctive. Perched on top of a stump or rock, the chipmunks vocalize long and vigorously, and the "chip" sound is often followed by a burst of sound called a "terminal pulse. Learn more about the Tamias merriami, more commonly known as a Merriam's Chipmunk, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.