• Squirrels can go down a tree head first because they can turn their back feet around. They have four toes on the front feet and five on the back.

• The squirrel nest, called a drey, is constructed in the forks of trees made of leaves and twigs. Males and females only share the nest during breeding seasons. Squirrels have one to four young and only one of those will live to a year old.• Squirrels have 22 teeth.• Predators of squirrels include humans, hawks, weasels, raccoons, fox, cats, snakes, owls and dogs.• The Michigan Institute of Technology has a Facebook page of its resident squirrels.• The lens of a squirrel's eye is yellow and acts like sunglasses to block glare. Squirrels can see in color except for red and green.