Armadillos are one of the oldest groups of mammals and have a quirky appearance, possessing a tough shell composed of bony plates in the dermis covered by horny scales. The giant armadillo is the largest living species of this group, and has 11 to 13 hinged bands protecting the body, and a further three or four on the neck. Its body is dark brown in colour, with a lighter, yellowish band running along the sides, and a pale, yellow-white head. These armadillos have around 80 to 100 teeth, which is more than any other mammal. They also possess extremely long front claws, including a sickle-shaped 3rd claw.