Nurse sharks are nocturnal creatures that usually spend the daytime resting under ledges or crevices in the reef. They are generally docile and do not present a threat to divers, although there are some, rather rare, reports of divers being bitten.
Unlike most other sharks that need to constantly move in order to breathe, the nurse shark can remain stationary and breathe by pumping water through their mouths and out gills.
The nurse shark hunts at night looking for crustaceans, mollusks, eels, stingrays and other fish. They often catch their prey that otherwise would be too quick for them by either going after fish that sleep at night or by using suction created by their small mouths and large throat cavities.