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

Chris & Monique Fallows / Ragged tooth shark (Carcharias taurus) showing teeth, De Hoop, South Africa.

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with Pilot Fish (Naucrates ductor), Bahamas, Caribbean

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010

Alex Mustard / Tiger shark (Galeocerdo cuvier) portrait over white sand. Little Bahama Bank, Bahamas.

Alex Mustard / Caribbean reef shark (Carcharhinus perezi) over sand ripples, Walkers Cay, Bahamas. Tropical West Atlantic Ocean. Taken with natural light.

Alex Mustard / A lone Caribbean reef shark (Carcharhinus perezi) cruises over sand ripples. Walkers Cay, Northern Bahama Islands, Republic of Bahamas.

Doug Perrine / Sand tiger shark {Carcharias taurus}, Atlantic Ocean.

Flip Nicklin / Sandbar Shark (Carcharhinus plumbeus) underwater portrait, bottom-dwelling coastal species, worldwide distribution

Flip Nicklin / Oceanic White-tip Shark (Carcharhinus longimanus) underwater portrait, North America