"Tree squirrels are the members of the squirrel family (Sciuridae) most commonly referred to as \"squirrels\". They include over a hundred primarily tree-dwelling species, native to all continents except Antarctica and Australia. They do not form a single natural, or monophyletic, group, but instead are related to the various other animals in the squirrel family, including ground squirrels, flying squirrels, marmots, and chipmunks."@en . . . .