Nurse sharks are very active during the night. In addition to swimming near the bottom, the Nurse shark can move around on the sea floor, using its flexible, muscular pectoral fins as limbs. Large juveniles and adults are usually found around deep coral reefs, and rocky areas at depths of up to 3-75 metres (10-246 feet) during the daytime, and then they migrate into shallower waters of less than 20 metres (66 feet) deep after darkness.