Squirrels knowns absolutely everybody. They are small, fast and have a good climbing technique. There is about 200 squirrel species in the world. Squirrels are part of rodents family and have four front teeth that never stop growing. There are three types of squirrels out there. Tree squirrels are the type that is most common. Seconds are the ground squirrels. The third are flying squirrels, they actually do not fly but they glide. Squirrels eat nuts, leaves, fruit, roots, seeds, and some insects. They have many predators so have to be really flexible.