Great white sharks live in coastal waters around the world and feed on fish, tuna, sting rays, dolphins, whales, and seals. They have a white underside and gray, slate, or blue-black coloring above. Adults typically reach 13 to 17 feet in length and can weigh up to 1200 pounds. While their breeding habits are not well understood, females sometimes give birth to litters of up to four pups. Great white sharks will usually only attack when provoked and have skeletons made of cartilage rather than bone.