Marine ecologist Neil Hammerschlag says he can sometimes identify sharks like Emma (pictured) by the way they move. "It's pretty cool to be able to jump in the water and say, 'Hey look, there's Emma the tiger shark!' " Neil Hammerschlag hide caption

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Neil Hammerschlag

A Marine Ecologist On Swimming With Sharks And What 'Jaws' Got Wrong

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The round stingray is native to the eastern Pacific coast and is notorious for injuring swimmers and surfers. laszlo-photo/Flickr hide caption

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laszlo-photo/Flickr

Mild-Mannered Stingrays Can Inflict A World Of Hurt

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