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Ginglymostoma cirratum. These bottom dwelling sharks are usually yellowish-tan to dark brown, and average around 8 to 9 feet long and over 200 pounds. They are nocturnal, scouting the sea bottom for crustaceans, mollusks and stingrays during the night, then returning to their preferred cave or crevice where they will often lay together in groups to sleep during the day. Nurse sharks are not aggressive, but there are attacks on record, often resulting from humans acting incautiously when sharing the water with the sharks.