Alligator's skin is tough. The skin on the animal's back is rough and ridged with dozens of small bones called osteoderms. The skin on the belly is smooth and was once used to make a handsom, long-lasting leather for handbags, shoes, and other articles. A young American alligator has yellow marks across its body, but these fade after a time. When grown, the American alligator is dull gray and dark olive in color.