Squirrels are a species in the Sciuridae, or squirrel, family. From chipmunks, to ground squirrels and prairie dogs, most squirrels share some traits. Many of these animals have thick fur coats of various lengths, and bushy tails. They typically have longer rear legs than front legs, and sturdy claws. Many species are adapted for climbing. The squirrel family contains over 285 species, and each one is unique.