Beavers may be best known for their remarkable ingenuity, but they are also naturally clean animals. Beavers utilize their double-claw toenail to comb and groom the fur while they relax. Beavers are well-adapted for semi-aquatic life. They have thick waterproof fur, a flattened tail that acts as a rudder, closable nostrils and ears, as well as a transparent eye membrane.