Shark ecologist and boat captain Juan Oliphant signals to tourists that a lot of sharks are approaching...
Shark ecologist and boat captain Juan Oliphant signals to tourists that a lot of sharks are approaching them on a cageless shark dive tour in Haleiwa, Hawaii February 16, 2015. Shark tours are a renowned form of eco-tourism in Hawaii and diving with sharks without a cage is becoming increasingly popular as well. Picture taken February 16, 2015. REUTERS/Hugh Gentry (UNITED STATES - Tags: ANIMALS ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY TRAVEL)