Corals are living organisms that live in mostly shallow waters leading up to island coastlines. While most make their living with algae that conduct photosynthesis, they can eat small fish they sting with cells called nematocysts.
When corals die, their outer exoskeleton hardens and is cemented into place among other remains of coral polyps. These corals can accumulate and build up into a formation known as a coral reef. The best example of a coral reef is the Great Barrier Reef off the coast of Australia. The reef provides a necessary habitat for many organisms such as small fish, octopuses, cuttlefish, crabs, and the like. With the availability of all these gamefish come the predator fish, looking to make a meal somewhere. The Great Barrier Reef is known in particular for Great White Shark hunting areas. Other species of sharks are hunters in the coral reef areas as well, such as Makos, Hammerheads, and Black-tipped sharks.