Tony Wu / Blacktip reef shark (Carcharhinus melanopterus) beaching itself to catch sardines. Tonga South Pacific.

Alex Mustard / Blacktip reef shark (Carcharhinus melanopterus) swims through schools of fish. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus) swimming just below surface at sunset, split level view. Off the island of Yap, Micronesia.

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

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

Doug Perrine / School of Blacktip sharks {Carcharhinus melanopterus}, Pacific.

Doug Perrine / Black tip reef sharks shoaling {Carcharhinus melanopterus} Moorea, French Polynesia (Non-ex).

Alex Mustard / Blacktip reef sharks (Carcharhinus melanopterus) circling over a shallow coral garden (Acropora spp.). Misool, Raja Ampat, West Papua, Indonesia. Misool Marine Protected Area. Ceram Sea. Tropical West...

Alex Mustard / Blacktip reef shark (Carcharhinus melanopterus) swims beneath a jetty and schools of silversides (Atherinidae) on a coral reef. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Paci...

Alex Mustard / Few fish from a school of Bigeye trevally (+Caranx sexfasciatus) break off to scratch themselves against the flank of a blacktip reef shark (Carcharhinus melanopterus). This is a common and world wide...

Tony Wu / Blacktip reef shark (Carcharhinus melanopterus) slicing through shallow water in pursuit of sardines, some of which can be seen jumping into the air to avoid being caught. Tonga, Pacific Ocean.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) over Vertigo reef, Yap, Micronesia.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) over Vertigo reef, Yap, Micronesia.

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus) just at the surface off the island of Yap, Micronesia.

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus) Yap, Micronesia.

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus) reflected off the surface of the water, island of Yap, Micronesia.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) off the island of Yap, Micronesia.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) off the island of Yap, Micronesia.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) off the island of Yap, Micronesia.

David Fleetham / Blacktip Reef Shark (Carcharhinus melanopterus). Hawaii.

David Fleetham / Blacktip Reef Sharks (Carcharhinus melanopterus) and various reef fish crowd the top of a Fijian reef in Beqa Lagoon. (Five images were digitally combined to create this panorama).

David Fleetham / Black tip reef shark (Carcharhinus melanopterus) and grey reef sharks (Carcharhinus amblyrhynchos), Yap, Micronesia.

Staffan Widstrand / Blacktip reef sharks (Carcharhinus melanopterus) swimming in shallows with shoal of fish, Raja Ampat, Western Papua, Indonesian New Guinea

Staffan Widstrand / Swimming with Blacktip reef shark (Carcharhinus melanopterus) Raja Ampat, Western Papua, Indonesian New Guinea

Franco Banfi / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Franco Banfi / Blacktip reef shark (Carcharhinus melanopterus) under the Zodiac, Aldabra Atoll, Natural World Heritage Site, Seychelles, Indian Ocean.

Graham Eaton / Blacktip reef shark (Carcharhinus melanopterus) juvenile in coastal waters, Maldives, Indian Ocean.

Graham Eaton / Blacktip reef sharks (Carcharhinus melanopterus), three juveniles swimming along shoreline in shallow waters, Maldives, Indian Ocean

Graham Eaton / Blacktip Reef Shark (Carcharhinus melanopterus) in clear shallow waters, rear view, Maldives, Indian Ocean.

Graham Eaton / Blacktip reef shark (Carcharhinus melanopterus) juvenile swimming over sand seabed along shoreline in shallow water, Maldives, Indian Ocean.

Graham Eaton / Blacktip reef shark (Carcharhinus melanopterus) swimming in shallow water, Maldives, Indian Ocean.

Graham Eaton / Blacktip reef shark (Carcharhinus melanopterus) juvenile in shallow water with track of movement in sand, Maldives, Indian Ocean.

Graham Eaton / Blacktip reef shark (Carcharhinus melanopterus) juvenile in shallow water, Maldives, Indian Ocean.

Jordi Chias / Black tip reef shark (Carcharhinus melanopterus) patrolling the Fakarava atoll, Tuamotu archipelago, French Polynesia, Pacific Ocean

Pascal Kobeh / Researcher in tank with Black tip reef Sharks (Carcharhinus melanopterus) where he tags them before releasing them. Vabbinfaru Island. North Male Atoll, Maldives. Indian Ocean.

Pete Oxford / Remora (Remora remora) attached to Oceanic Black tip shark (Carcharhinus limbatus) Umkomaas. KwaZulu Natal, South Africa.

Pete Oxford / Oceanic Black tip shark (Carcharhinus limbatus) with Remora (Remora remora) Umkomaas. KwaZulu Natal, South Africa.

Mark MacEwen / Blacktip Reef Shark (Carcharhinus melanopterus) on edge of beach, Heron Island, Great Barrier Reef, Australia.

Mark MacEwen / Blacktip Reef Shark (Carcharhinus melanopterus) swimming near edge of beach, Heron Island, Great Barrier Reef, Australia.

Mark MacEwen / Blacktip Reef Shark (Carcharhinus melanopterus) on edge of beach, Heron Island, Great Barrier Reef, Australia.

Michele Westmorland / White-tip reef sharks (Triaenodon obesus) and school of Black Striped Salema (Xenocys jessiae) Galapagos Islands.

Michele Westmorland / White-tip reef sharks (Triaenodon obesus) and school of Black Striped Salema (Xenocys jessiae) Galapagos Islands.

Michele Westmorland / White-tip reef sharks (Triaenodon obesus) and school of Black Striped Salema (Xenocys jessiae) Galapagos Islands.

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) and Remora (Remora remora), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus), Umkomaas, Kwazulu Natal, South Africa

Michael Pitts / Black tip reef shark (Carcharinus melanopterus) caught with fishing line and discarded, Solomon Islands, Pacific.

Doug Perrine / Blackfin / Blacktip reef shark (Carcharhinus melanopterus) cruises the shoreline, hunting for Swift / Crested tern chicks (Sterna bergii) that are washed into the water by the rising tide, Turu Cay, T...

Doug Perrine / Blackfin / Blacktip reef shark (Carcharhinus melanopterus) returns to deeper water after beaching itself while hunting for Swift / Crested tern chicks (Sterna bergii) that are washed into the water by...

Doug Perrine / Blackfin / Blacktip reef shark (Carcharhinus melanopterus) swallows a Swift / Crested tern chick (Sterna bergii) that has been washed into the water by the rising tide, Turu Cay, Torres Straits, Queen...

Doug Perrine / Blackfin / Blacktip reef shark (Carcharhinus melanopterus) cruises the shoreline, hunting a Swift / Crested tern chick (Sterna bergii) that has been washed into the water by the rising tide, Turu Cay,...

Juergen Freund / Baby Blacktip reef shark pups (Carcharhinus melanopterus) sold in the Sorong market, West papua, Indonesia, July 2009.

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 sharks (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.

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

Miles Barton / Black tip reef shark in shallow water (Carcharhinus melanopterus) Aldabra, Seychelles

JEFF FOOTT / Two Blacktip reef sharks {Carcharhinus melanopterus} patrolling shallow water, surrounded by other fish, Rangiroa, French Polynesia

JEFF FOOTT / Split level view of Black tip reef shark {Carcharhinus melanopterus}, French Polynesia

JEFF FOOTT / Split level Blacktip reef {Carcharhinus melanopterus} shark in shallows, French Polynesia.

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus) and a remora (Echeneis naucrates), Indonesia.

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) and Black-tip Shark (Carcharhinus limbatus) group hunting Yellowfin Tuna (Thunnus albacares), Punta Albemarle, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) and Black-tip Shark (Carcharhinus limbatus) fighting over Yellowfin Tuna (Thunnus albacares) prey, Punta Albemarle, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Black-tip Shark (Carcharhinus limbatus) feeding on Yellowfin Tuna (Thunnus albacares) carcass, Punta Albemarle, Isabela Island, Galapagos Islands, Ecuador

Pete Oxford / Black-tip Reef Shark (Carcharhinus melanopterus) swimming over reef, Beqa Lagoon, Viti Levu, Fiji

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) pair swimming near surface, Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) and Remora (Remora remora), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) with Remoras (Remora remora), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) with Remoras (Remora remora), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) with two attached Remoras (Remora remora), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus), Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) trio circling chum bucket and diver during baited shark dive, Umkomaas, Kwazulu Natal, South Africa

Onne van der Wal / Black tipped reef sharks, Polynesia.

Flip Nicklin / Black-tip Reef Shark (Carcharhinus melanopterus) underwater portrait, North America

Sirachai Arunrugstichai / Aerial view of Blacktip reef shark (Carcharhinus melanopterus) pup prowling over a sand flat along the water's edge by the beach of Maya Bay, Hat Noppharat Thara - Mu Koh Phi Phi National Park, Krabi,...

Shane Gross / Blacktip reef shark (Carcharhinus melanopterus) juvenile, swimming in shallow water close to shore with the island of Moorea in background, French Polynesia, Pacific Ocean.

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus) swimming through baitball of sardine (Sardinops sp.) near water surface in open ocean, Moalboal, Cebu, Central Visayas, Philippines, Pacific Ocean.

David Fleetham / Three Blacktip reef sharks (Carcharhinus melanopterus) silhouetted just below the ocean surface, Yap, Micronesia, Pacific Ocean.

David Fleetham / Dorsal fin of Blacktip reef shark (Carcharhinus melanopterus) breaking water surface, at sunset, off island of Yap, Micronesia. Philippines sea, Pacific Ocean.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) cruising just below the surface, Yap, Micronesia, Pacific Ocean.

David Fleetham / Blacktip reef sharks (Carcharhinus melanopterus) circling the reef surrounded by various reef fish, Yap, Micronesia, Pacific Ocean.

Sirachai Arunrugstichai / Blacktip reef shark (Carcharhinus melanopterus) circling over a half-eaten Yellowback fusilier (Caesio xanthonota) carcass, that was attacked by a Barracuda (Sphyraena sp.) on a shallow reef at night,...

David Fleetham / Blacktip reef shark (Carcharhinus melanopterus), portrait, Yap, Micronesia, Pacific Ocean.

Tui De Roy / Aerial view of Galapagos sea lion (Zalophus wollebaeki) hunting cooperatively by driving Amberstripe scad fish (Decapterus moruadsi) from open sea to small cove, with Blacktip reef sharks (Carcharhinu...

Tui De Roy / Aerial view of Galapagos sea lion (Zalophus wollebaeki) hunting cooperatively by driving Amberstripe scad fish (Decapterus moruadsi) from open sea to small cove, with Blacktip reef sharks (Carcharhinu...

Juergen Freund / Blacktip reef shark (Carcharhinus melanopterus) juveniles in coastal waters, split level image. Raja Ampat Islands, Indonesia.

Juergen Freund / Blacktip reef shark (Carcharhinus melanopterus) group in shallows of a Marine Protected Area. Good shark numbers are a sign protection is working. Raja Ampat Islands, West Papua, Indonesia.

Willem Kolvoort / Blacktip reef shark (Carcharhinus melanopterus) and trevally (Caranx sp) in shallow water close to the beach, Picard island, Aldabra, Indian Ocean

Willem Kolvoort / Split level view of Blacktip reef shark (Carcharhinus melanopterus) in shallow water close to the beach, Picard island, Aldaba, Indian Ocean