They include a number of common types, such as catsharks, swellsharks, and the sandbar shark. Natural predators of the sandbar shark include the tiger shark, and rarely great white sharks. The sandbar shark is also called the thickskin shark or brown shark. The sandbar shark itself preys on fish, rays, and crabs. Its genus, "Carcharhinus", also includes the sandbar shark, which is not capable of osmoregulation.