All tree squirrels have ultra sharp claws in common. When a squirrel digs his needle-like nails into a tree limb, he can get a strong grip, allowing him to climb upwards and downwards, or even cling to a tree limb or tree trunk using only his hind legs. His claws also allow him to grip as he jumps from tree to tree, using his tail as a rudder, allowing him to swerve or stay the course.