Saltwater Crocodiles live in mangrove and salt marshes on the coast near the reef. No crocodile nests have been found on the reef. The salt water crocodiles on the reef travel long distances. There are not many living around the reef. Around 125 species of shark, stingray, skates or chimaera live on the reef. About 5,000 species of mollusc live on the reef. These include the giant clam, nudibranchs and cone snails. Forty-nine species of pipefish and nine species of seahorse have been found. Seven species of frogs live on the islands. Also, the Moray eel lives on the bottom, preying on fish.