David Fleetham / Whitetip reef shark (Triaenodon obesus) resting on sea floor. Kauai, Hawaii.

Jeff Rotman / Whitetip reef sharks (Triaenodon obesus) pack silhouetted following scent trail in water column, Cocos Island, Costa Rica, Pacific Ocean

Pete Oxford / Caribbean reef shark (Carcharhinus perezi) Jardines de la Reina National Park, Cuba

Juergen Freund / Whitetip reef shark (Triaenodon obesus) at reef, West New Britain, Papua New Guinea.

Alex Mustard / Caribbean reef shark (Carcharhinus perezi) swims over a coral reef. Grand Bahama Island, Bahamas. Tropical West Atlantic Ocean.

Alex Mustard / Caribbean reef shark (Carcharhinus perezi) swimming over a coral reef, beneath a snorkeler and boat. Near Grand Bahama, Bahamas. Tropical West Atlantic Ocean.

Jeff Rotman / Whitetip Reef sharks (Triaenodon obesus) following scent trail in water column, Cocos Island, Costa Rica, Pacific Ocean.

Jeff Rotman / Whitetip Reef Sharks (Triaenodon obesus) following scent trail in water column, Cocos Island, Costa Rica, Pacific Ocean.

Juergen Freund / Whitetip reef shark (Triaenodon obesus) and Grey reef sharks (Carcharhinus amblyrhynchos) at North Horn, Queensland, Australia

Georgette Douwma / Tiger shark patrolling shallow water for egg laying turtles. Australia {Galeocerdo

Pete Oxford / Whitetip reef sharks {Triaenodon obesus} in shallows near shore, Bartolome Is, Galapagos

Jeff Rotman / Tiger shark portrait (Galeocerdo cuvieri) Great Barrier Reef, Australia