Thirteen-lined Ground Squirrels are often seen standing on their hind legs on roadsides or other places where grass is mowed, such as lawns, golf courses, or cemeteries. The squirrels probably once lived in short-grass prairie, and some human habitats suit them well. Learn more about the Spermophilus tridecemlineatus, more commonly known as a Thirteen-lined Ground Squirrel, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.