Enjoy the ability to change layout in your store easily as seasons and specific birds change. Enhance your store's image with stunning bird signage and promote sales! There are over 365 species of squirrels in seven families. They include the tree squirrel, ground squirrel, and flying squirrel, plus many squirrel-like mammals such as the gopher, ground hog, and prairie dog. It is the largest group of living mammals on Earth.