In the world there are 289 species of squirrels, they are in the Sciuridae family. This family covers a highly diverse population of species and includes tree squirrels, ground squirrels, flying squirrels, prairie dogs, chipmunks, woodchucks and more. In the United States there are more than 65 different types of squirrels. There are 24 types of ground squirrels, 22 species of chipmunks, plus marmots, prairie dogs, and of course the tree squirrels. Wisconsin has 5 species of tree squirrels: the