Nurse shark
Ginglymostoma cirratum
The nurse shark clings to shallow sand flats, channels and coral reefs where they feed on bottom-dwelling creatures such as spiny lobsters, crabs, squid, snails and sea urchins as well as fishes including stingrays and puffers.
They have demonstrated a strong preference to particular resting sites and return to the same caves after their nocturnal antics. They are normally docile creatures and will swim away when approached, but when nurse sharks have attacked their strong bite can inflict serious injury and sometimes the jaws have only been removed with the aid of surgical instruments.
The meat of a nurse shark is edible but they are hunted mainly for their skin which makes tough and durable leather. Although they have no regular predators, remains of nurse sharks have been found in the stomachs of tiger sharks and lemon sharks, and attacks by bulls sharks and great hammerhead sharks have been witnessed.
Related links:
IUCN Red List of Threatened Species
MarineBio.org
International Shark Attack File