Franco Banfi / Nurse shark (Ginglymostoma cirratum) stealing fish from diver. Chinchorro Banks Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico. May 2015.

Franco Banfi / Nurse shark (Ginglymostoma cirratum) swimming over reef. Chinchorro Banks Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico.

Franco Banfi / Nurse shark (Ginglymostoma cirratum) swimming through coral reef. Chinchorro Banks Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico. May 2015.

Alex Mustard / Tawny nurse shark (Nebris ferrungineus) patrols a coral reef at night. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / Tawny nurse shark (Nebrius ferrugineus) at night. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Tawny nurse shark (Nebrius ferrugineus) at night. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Tawny nurse shark (Nebrius ferrugineus) group at night. Vavuu Atoll, Maldives. Indian Ocean.

Alex Mustard / Nurse shark (Ginglymostoma cirratum) with damaged jaw swimming over coral reef in evening. North Wall, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Jordi Chias / Tawny nurse shark (Nebrius ferrugineus) Vaavu Atoll, Maldives, Indian Ocean.

Alex Mustard / Two Atlantic spotted dolphins (Stenella frontalis) hunting a school of palometa fish (Trachinotus goodei) that have surrounded a nurse shark (Ginglymostoma cirratum) for protection. South Bimini, Baha...

Alex Mustard / Close up portrait of the face of a Nurse shark (Ginglymostoma cirratum) resting on the sand in shallow water. Its barbels are clearly visible on its top lip. South Bimini, Bahamas. The Bahamas Nationa...