Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus), Solitary Islands Marine Park, New South Wales, Australia

Alex Mustard / Tawny nurse sharks (Nebris ferrungineus) at night. Vavuu Atoll, Maldives. Indian Ocean

Shane Gross / Nurse sharks (Ginglymostoma cirratum) two in a courtship dance at sunrise in a mangrove area near Eleuthera, Bahamas.

Alex Mustard / Tawny nurse shark (Nebrius ferrugineus) group, individuals circling each other at dusk. Vavuu Atoll, Maldives. Indian Ocean.

Pete Oxford / Nurse Shark (Ginglymostoma cirratum) Hol Chan Marine Reserve, Belize Barrier Reef, Belize.

Alex Mustard / Nurse shark (Ginglymostoma cirratum) young caught in a fishtrap. North Sound, Grand Cayman, Cayman Islands. Caribbean Sea.

Doug Perrine / Nurse shark {Ginglymostoma cirratum}, Bahamas.

Doug Perrine / Nurse shark on coral reef {Ginglymostoma cirratum} Bahamas, Caribbean Sea (Non-ex).

Doug Perrine / Tawny nurse shark asleep under coral reef ledge {Nebrius ferrugineus} Burma Banks, Thailand, Andaman Sea (Non-ex).

Rick Price / Tawny nurse shark (Nebrius ferrugineus) at water surface. Talbot Bay, The Kimberley, Western Australia.

Rick Price / Tawny nurse shark (Nebrius ferrugineus) below water surface. Talbot Bay, The Kimberley, Western Australia.

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus) and diver, Solitary Islands Marine Park, New South Wales, Australia

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus), Fish Rock, New South Wales, Australia

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus), Fish Rock, New South Wales, Australia

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus) scraping parasites off in sand, Solitary Islands Marine Park, New South Wales, Australia

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus), Solitary Islands Marine Park, New South Wales, Australia

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus), Solitary Islands Marine Park, New South Wales, Australia

Gary Bell/ Oceanwide / Grey Nurse Shark (Carcharias taurus), Solitary Islands Marine Park, New South Wales, Australia

Ralph Pace / Short-tail Nurse Shark (Ginglymostoma cirratum), Saint Eustatius, Caribbean

Shane Gross / Nurse shark (Ginglymostoma cirratum) male biting onto the pectoral fin of a female whilst mating, Eleuthera, Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) male biting onto the pectoral fin of a female whilst mating, Eleuthera, Bahamas.

Shane Gross / Nurse sharks (Ginglymostoma cirratum) ready to mate. Showing male claspers, which are used to channel semen into the female during mating, Eleuthera, Bahamas.

Shane Gross / Nurse sharks (Ginglymostoma cirratum) ready to mate. Showing male claspers, which are used to channel semen into the female during mating, Eleuthera, Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) two males bite onto the pectoral fins of a larger female while trying to mate with her, Eleuthera, Bahamas

Shane Gross / Nurse shark (Ginglymostoma cirratum) male biting onto the pectoral fin of a female whilst mating, Eleuthera, Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) male biting onto the pectoral fin of a female whilst mating, Eleuthera, Bahamas.

Shane Gross / Close up view of the eye of Nurse shark (Ginglymostoma cirratum) The Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) resting in shallow water at sunset to save energy for mating which will take place the next morning. Eleuthera, Bahamas.

Shane Gross / Nurse sharks (Ginglymostoma cirratum) three in a courtship dance at sunrise in a mangrove area near Eleuthera, Bahamas.

Shane Gross / Nurse sharks (Ginglymostoma cirratum) three in a courtship dance at sunrise in a mangrove area near Eleuthera, Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) resting near a coral reef and other fish like blue tangs in The Bahamas.

Shane Gross / Nurse sharks (Ginglymostoma cirratum) three in a courtship dance at sunrise in a mangrove area, Eleuthera, Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) juvenile hiding under the reef, The Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) pup, swimming in a mangrove forest. Bimini, Bahamas.

Shane Gross / Nurse shark (Ginglymostoma cirratum) hiding under a ship wreck in Caribbean sea off Cancun, Yucatan, Mexico.

Shane Gross / Nurse shark (Ginglymostoma cirratum) bites onto a female while mating in the shallows, with another male nearby. Eleuthera, Bahamas. Awarded in underwater category, Wildlife Photographer of the Year 2...

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

David Fleetham / Nurse shark (Ginglymostoma cirratum) with a school of juvenile jacks and remora, Bahamas.

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...

Alex Mustard / Three Nurse sharks (Ginglymostoma cirratum) on the sand in shallow water. The barbels of the front shark are clearly visible hanging down from its top lip. South Bimini, Bahamas. The Bahamas National...

Alex Mustard / Nurse sharks (Ginglymostoma cirratum) group patrolling on a shallow, South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream, West Atlantic Ocean.

Alex Mustard / Nurse shark (Ginglymostoma cirratum) portrait, resting on the sand in shallow water. Its barbels are clearly visible on its top lip. South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf S...

Alex Mustard / Nurse sharks (Ginglymostoma cirratum) over seagrass at night. White spiracle behind eye is visible. South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream, West Atlantic Ocean.

Alex Mustard / Nurse shark (Ginglymostoma cirratum) cruising over seagrass at night. South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream, West Atlantic Ocean.

Franco Banfi / Nurse shark (Ginglymostoma cirratum) resting on seabed with a Great hammerhead shark (Sphyrna mokarran) swimming nearby, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Oce...

Franco Banfi / Nurse shark (Ginglymostoma cirratum) using its pectoral fins to walk on the seabed, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Nurse shark (Ginglymostoma cirratum) with Bar jacks (Caranx ruber) and Remora fish, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Nurse shark (Ginglymostoma cirratum) resting on the seabed with Remora fish, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Great hammerhead shark (Sphyrna mokarran) swimming over sandy seabed with a Nurse shark (Ginglymostoma cirratum), Bar jacks (Caranx ruber) and Remora fish in the background, South Bimini, Bahamas. The...

Franco Banfi / Nurse shark (Ginglymostoma cirratum) using pectoral fins to walk along the seabed, with Bar jacks (Caranx rubus) nearby, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocea...

Franco Banfi / Nurse sharks (Ginglymostoma cirratum) resting on sandy seabed with Bar jacks (Caranx ruber), South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Nurse sharks (Ginglymostoma cirratum) on a sandy seabed with Bar jacks (Caranx ruber) and Remora fish, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Nurse shark (Ginglymostoma cirratum) throwing up sand as it hunts in the sandy seabed, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Close up of Nurse shark (Ginglymostoma cirratum) using pectoral fins to walk along the seabed, South Bimini, Bahamas. The Bahamas National Shark Sanctuary, West Atlantic Ocean.

Franco Banfi / Great hammerhead shark (Sphyrna mokarran) swimming over sandy seabed with resting Nurse sharks (Ginglymostoma cirratum), Bar jacks (Caranx ruber) and Remora fish, South Bimini, Bahamas. The Bahamas Na...

Franco Banfi / Great hammerhead shark (Sphyrna mokarran) swimming over sandy seabed near resting Nurse sharks (Ginglymostoma cirratum), Bar jacks (Caranx ruber) and Remora fish, South Bimini, Bahamas. The Bahamas Na...

Jordi Chias / Nurse sharks (Ginglymostoma cirratum) and Round ribbontail stingray (Taeniurops meyeni) feeding at night, Felidhoo Atoll, Maldives, Indian Ocean

Pete Oxford / Nurse shark (Ginglymostoma cirratum) and Caribbean reef shark (Carcharhinus perezi) Lighthouse Reef Atoll, Belize.

Pete Oxford / Nurse shark (Ginglymostoma cirratum) Hol Chan Marine Reserve, Belize Barrier Reef, Belize.

Pete Oxford / Nurse Shark (Ginglymostoma cirratum) and Sharksucker (Echeneis naucrates) Halfmoon Caye. Lighthouse Reef Atoll, Belize.

Pete Oxford / Nurse shark (Ginglymostoma cirratum) Hol Chan Marine Reserve, Belize Barrier Reef, Belize.

Pete Oxford / Nurse Shark (Ginglymostoma cirratum) Halfmoon Caye, Lighthouse Reef Atoll, Belize.

Pete Oxford / Nurse shark (Ginglymostoma cirratum) Halfmoon Caye, Lighthouse Reef Atoll, Belize.

Pete Oxford / MAR Alliance researchers taking samples from Great barracuda (Sphyraena barracuda) with Nurse shark (Ginglymostoma cirratum) in the water below after samples have been taken. The samples are to deter...

Pete Oxford / Nurse sharks (Ginglymostoma cirratum) in shallow water, Halfmoon Caye, Lighthouse Reef Atoll, Belize.

Pete Oxford / Nurse Shark (Ginglymostoma cirratum) & Evaristo Muschamp Marine Megafauna Research. Large marine fish, sharks, rays & turtles. MAR Alliance Halfmoon Caye Lighthouse Reef Atoll Belize Central Ame...

Pete Oxford / Nurse shark (Ginglymostoma cirratum) caught with hook for research by MAR Alliance, Lighthouse Reef Atoll, Belize. May 2015.

Pete Oxford / Nurse shark (Ginglymostoma cirratum) caught for research by MAR Alliance, Lighthouse Reef Atoll, Belize. May 2015.

Pete Oxford / Nurse sharks (Ginglymostoma cirratum) in shallows, Halfmoon Caye, Lighthouse Reef Atoll, Belize

Pete Oxford / Nurse shark (Ginglymostoma cirratum) and Horse-eye jacks (Caranx latus) Shark Ray Alley, Hol Chan Marine Reserve, Belize Barrier Reef. Belize.

Pete Oxford / Nurse shark (Ginglymostoma cirratum) and Horse-eye jacks (Caranx latus) Shark Ray Alley, Hol Chan Marine Reserve, Belize Barrier Reef, Belize.

Pete Oxford / Group of Nurse shark (Ginglymostoma cirratum) Shark Ray Alley, Hol Chan Marine Reserve, Belize.

Pascal Kobeh / Tawny nurse shark (Nebrius Ferrugineus) Bijoutier, Seychelles. Indian Ocean.

Pete Oxford / Short-tail Nurse Shark (Ginglymostoma cirratum) trio, Hol Chan Marine Reserve, Belize

Pete Oxford / Short-tail Nurse Shark (Ginglymostoma cirratum) and Horse-eye Trevally (Caranx latus) school, Hol Chan Marine Reserve, Belize

Pete Oxford / Short-tail Nurse Shark (Ginglymostoma cirratum) and Horse-eye Trevally (Caranx latus) school, Hol Chan Marine Reserve, Belize

Juergen Freund / Tawny nurse shark (Nebrius ferrugineus) swimming above sand flat, Great Barrier Reef, Queensland, Australia.

Pascal Kobeh / Two nurse sharks (Nebrius ferrugineus) resting on sea floor, Maldives. Indian Ocean.

Pascal Kobeh / Two nurse sharks (Nebrius ferrugineus) resting on sea floor, Maldives. Indian Ocean.

Pascal Kobeh / Diver near two Nurse sharks (Nebrius ferrugineus) resting, Maldives. Indian Ocean. April 2013.

Pascal Kobeh / Diver near two Nurse sharks (Nebrius ferrugineus) resting, Maldives. Indian Ocean. April 2013.

Pascal Kobeh / Atlantic nurse shark (Ginglymostoma cirratum), San Salvador Island / Colombus Island, Bahamas. Caribbean.

Alex Mustard / Skin of a nurse shark (Ginglymostom cirratum) showing the rough placoid scales, commonly called denticles. These scales have the same structure as the shark's teeth and are as rough as sandpaper when...

Pete Oxford / Grey Nurse Shark (Carcharias taurus), Umkomaas, Kwazulu Natal, South Africa

Michele Westmorland / Scuba diver with Nurse shark (Ginglymostoma cirratum) in healthy marine life area 'Grand Canyon'. Grenada, West-Indies, Caribbean, May 2009. Model relased.