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).

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.

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.