Ian Coleman / Illustration of Grey reef shark (Carcharhinus amblyrhynchos), Carcharhinidae. Endangered / threatened species.

Juergen Freund / Richard Fitzpatrick releases Grey reef shark {Carcharhinus amblyrhynchos} after inserting transmitter into its belly, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) at North Horn, Queensland, Australia

Juergen Freund / Grey Reef sharks (Carcharhinus amblyrhynchos) at North Horn teeming at water surface

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhynchos}, Micronesia.

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhynchos} on coral reef Micronesia.

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhynchos} Micronesia.

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhynchos} near surface Micronesia.

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) feeding on a large baitfish ball, Solomon Islands, South Pacific

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) feeding on a large baitfish ball, Solomon Islands

Doug Perrine / Grey reef shark group {Carcharhinus amblyrhynchos} Bikini Atoll, Micronesia, Pacific Ocean (Non-ex).

Juergen Freund / Grey reef shark dead on seabed after removal of fins {Carcharhinus amblyrhynchos} Philippines

Juergen Freund / Grey reef shark {Carcharhinus amblyrhynchos} with Remora fish, Great Barrier reef, Queensland, Australia

Michael Pitts / Grey reef shark {Carcharhinus amblyrhynchos} Nassau, Bahamas, Caribbean

Michael Pitts / Grey reef shark close up {Carcharhinus amblyrhynchos} Grand Bahamas, Caribbean

Richard Robinson / Thicklipped jack (Pseudocaranx dentex ) swimming in front of nose of Grey Reef Shark (Carcharhinus amblyrhynchos) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific bet...

David Fleetham / Grey reef shark (Carcharhinus amblyrhynchos), opens it's mouth during a shark feed off the island of Yap, Micronesia.

Franco Banfi / Grey reef shark (Carcharhinus amblyrhynchos) North Point dive site, Sanganeb reef, Sudan, Red Sea

Doug Perrine / Grey reef shark (Carcharhinus amblyrhynchos) upper and lower teeth, on display at Oceanographic Museum of Monaco, Principality of Monaco (digitally modified)

Jordi Chias / Grey reef sharks (Carcharhinus amblyrhynchos) in the south pass of Fakarava Tuamotus, French Polynesia, South Pacific

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) viewed from below, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef shark (Carcharhinus perezi) viewed from below, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) swimming over the reef, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Caribbean reef sharks (Carcharhinus perezi) Northern Bahamas, Caribbean Sea, Atlantic Ocean

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) group, one with Remora (Remora) Coral Sea, Great Barrier Reef, Queensland, Australia.

Pascal Kobeh / Two Grey reef sharks (Carcharhinus amblyrhynchos) in a school of Bonitos / Amberjacks (Sarda ou Seriola ) Palau. Philippine Sea.

Pete Oxford / Grey Reef Shark (Carcharhinus amblyrhynchos), Beqa Lagoon, Viti Levu, Fiji

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) in Great Barrier Reef, Coral Sea, Queensland, Australia

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) in Great Barrier Reef, Coral Sea, Queensland, Australia

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) in Great Barrier Reef, Coral Sea, Queensland, Australia

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) in Great Barrier Reef, Coral Sea, Queensland, Australia

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) in Great Barrier Reef, Coral Sea, Queensland, Australia

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) in Great Barrier Reef, Coral Sea, Queensland, Australia

Juergen Freund / Sharks, mainly grey reef sharks (Carcharinus amblyrhynchos) feed at bait, North Horn, Osprey Reef, Coral Sea, January

Franco Banfi / Grey reef shark (Carcharhinus amblyrhynchos) patrolling reef, Maldives, Indian Ocean

Franco Banfi / Grey reef shark (Carcharhinus amblyrhynchos) Maldives, Indian Ocean

Franco Banfi / Shooling Grey reef sharks (Carcharhinus amblyrhynchos) Maldives, Indian Ocean

Franco Banfi / Grey reef shark (Carcharhinus amblyrhynchos) Maldives, Indian Ocean

Franco Banfi / Grey reef sharks (Carcharhinus amblyrhynchos) swimming though shoal of fish, Maldives, Indian Ocean

Franco Banfi / Grey reef shark (Carcharhinus amblyrhynchos) swimming through shoal of fish, Maldives, Indian Ocean

Cheryl-Samantha Owen / Grey reef shark (Carcharhinus amblyrhynchos), Aldabra Atoll, Seychelles, Indian Ocean

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos), Coral Sea, Australia

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) dead after its fins were cut off for shark fin soup, Thailand

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) dead after becoming entangled in fishing net, Thailand

Juergen Freund / Grey Reef shark (Carcharhinus amblyrhynchos) taking bait, North Horn, Queensland, Australia.

Juergen Freund / Grey Reef shark (Carcharhinus amblyrhynchos) attacking bait, North Horn, Queensland, Australia.

Juergen Freund / Grey reef shark (Carcharhinus amblyrhynchos) at North Horn, Queensland, Australia

Juergen Freund / Grey Reef sharks (Carcharhinus amblyrhynchos) at North Horn teeming at water surface

Juergen Freund / Grey Reef sharks (Carcharhinus amblyrhynchos) and other fish species just under surface at North Horn

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) at North Horn, Queensland, Australia

Juergen Freund / Underside of Grey reef shark (Carcharhinus amblyrhynchos) and other fish at North Horn, Queensland, Australia

Juergen Freund / Grey reef sharks (Carcharhinus amblyrhynchos) and other fish at North Horn, Queensland, Australia

Juergen Freund / Great reef shark (Carcharhinus amblyrhnchos) and other fish with a "shark attack" cage, North Horn, Queensland, Australia.

Michael Pitts / Grey reef shark {Carcharhinus amblyrhynchos} Grand Bahamas, Caribbean

Susan McMillan / Grey reef shark (Carcharihinus amblyrhynchos) caught by fisherman, Aldabra, Gambia

J Foott / Grey reef shark {Carcharhinus amblyrhynchos} patrolling over coral reef, French polynesia, Pacific Ocean

Juergen Freund / Grey reef sharks {Carcharhinus amblyrhynchos} Great Barrier Reef, Australia.

JEFF FOOTT / Split-level - Grey reef shark {Carcharhinus amblyrhynchos} Rangiroa, French Polynesia

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) portrait, Nigali Passage, Fiji

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) feeding on a large baitfish ball, Solomon Islands, South Pacific

JEFF FOOTT / Grey reef shark {Carcharhinus amblyrhynchos} Split level French Polynesia

Juergen Freund / Grey reef shark lured to surface {Carcharhinus amblyrhynchos} Great Barrier

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhychos} Bikini Atoll, Micronesia (Non-ex).

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhychos} Bikini Atoll, Micronesia (Non-ex).

Doug Perrine / Grey reef sharks {Carcharhinus amblyrhynchos} Bikini Atoll, Micronesia (Non-ex).

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhychos} Bikini Atoll, Micronesia (Non-ex).

Doug Perrine / School of Grey reef sharks {Carcharhinus amblyrhychos} Bikini Atoll, Micronesia (Non-ex).

Juergen Freund / Grey reef shark underside {Carcharhinus amblyrhynchos} with Remora fish, Great Barrier reef, Queensland, Australia

Juergen Freund / Fisherman cuts fin from Grey reef shark {Carcharhinus amblyrhynchos} Philippines

Juergen Freund / Grey reef shark dead on seabed after removal of fins {Carcharhinus amblyrhynchos} Philippines

Juergen Freund / Grey reef shark {Carcharhinus amblyrhynchos}, Great Barrier reef, Queensland, Australia

Juergen Freund / Grey reef shark with rainbow runners rubbing themselves against shark's skin {Carcharhinus amblyrhynchos} Great Barrier reef, Queensland, Australia

Juergen Freund / Grey reef shark {Carcharhinus amblyrhynchos} Coral sea, Queensland, Australia

Michael Pitts / Grey reef shark {Carcharhinus amblyrhynchos} Grand Bahamas, Caribbean

Juergen Freund / Grey reef shark {Carcharhinus amblyrhynchos} Sulu-sulawesi seas, Indo-pacific

Pete Oxford / Grey Reef Shark (Carcharhinus amblyrhynchos), Beqa Lagoon, Viti Levu, Fiji

Roberto Rinaldi / Divers in a shark cage watching Grey reef sharks (Carcharhinus amblyrhynchus), Flinders reef, Australia

Ian Coleman / Illustration of pelvic fin of Gray reef shark (Carcharhinus amblyrhynchos). Endangered/threatened species.

Ian Coleman / Illustration of pectoral fin of Gray reef shark (Carcharhinus amblyrhynchos). Endangered / threatened species.

Michael Pitts / Grey reef sharks {Carcharhinus amblyrhynchos} Yap Micronesia

Juergen Freund / Fisherman removes fin of Grey reef shark {Carcharhinus ambly- rhynchos} Philippines

Juergen Freund / Fisherman removes fin of Grey reef shark {Carcharhinus ambly- rhynchos} Philippines

Juergen Freund / Grey reef shark dead after fin removal {Carcharhinus amblyrhynchos} GBR Australia

Noemie Stroh / Yellowfin surgeonfish (Acanthurus xanthopterus) aggregation above coral reef. Grey reef shark (Carcharhinus amblyrhynchos) juveniles are patrolling the school. Ohotu reef, North Fakarava, French polyn...

Noemie Stroh / Yellowfin surgeonfish (Acanthurus xanthopterus) aggregation above coral reef. Grey reef shark (Carcharhinus amblyrhynchos) juveniles are patrolling the school. Ohotu reef, North Fakarava, French polyn...

Doug Perrine / Gray reef shark (Carcharhinus amblyrhynchos) juveniles swimming under water surface, Mahaiula, North Kona, Hawaii, United States, Pacific Ocean.

Doug Perrine / Gray reef shark (Carcharhinus amblyrhynchos) juveniles swimming under water surface, Mahaiula, North Kona, Hawaii, United States, Pacific Ocean.

Doug Perrine / Two Gray reef shark (Carcharhinus amblyrhynchos) juveniles swimming under water surface with Triggerfish (Balistidae sp.) behind, Mahaiula, North Kona, Hawaii, United States, Pacific Ocean.