Two sperm whales, members of a social unit named "The Group of Seven," begin a dive together in the deep waters close to Dominica, West Indies. Courtesy of Luke Rendell/Whitehead Lab Dominica Sperm Whale Project hide caption

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"Anytime you're in the wild with a beautiful animal you're going to feel good," says Susan Casey, author of Voices in the Ocean: A Journey into the Wild and Haunting World of Dolphins. Penguin Random House hide caption

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Exploring The 'Wild And Haunting World Of Dolphins'
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Some researchers have begun to question the notion that dolphins are the super-intelligent creatures they've been made out to be. Pavel Golovkin/AP hide caption

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Dolphins: Adorable, Playful, Not As Smart As You Might Think
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Demonstrators at a rally in Tokyo on August 31 protest against the start of Japan's annual dolphin hunt in Taiji. Yoshikazu Tsuno/AFP/Getty Images hide caption

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An elephant at the Emmen, Netherlands, zoo stands at the edge of a ditch in 2009, a day after another elephant fell into the ditch and died. Olaf Kraak/AFP/Getty Images hide caption

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