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...