What is a gray nurse shark?

Also called the spotted, ragged toothed shark or the sand tiger shark, grey nurse sharks are a large species of shark measuring about 11 feet long and weighing between 200 and 350 lbs. Despite their formidable appearance, they aren't aggressive unless provoked. They eat bony fish, other sharks, rays, squid, and crustaceans, and live in temperate, tropical, and subtropical coastal waters all over the world. However, they are considered endangered.