Third of open ocean sharks face extinction: study

A third of the world's open water sharks -- including the great white and hammerhead -- face extinction, according to a major conservation survey released Thursday.

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<p><a href="http://www.physorg.com/news165153468.html">Third of open ocean sharks face extinction: study</a></p> <p>A third of the world's open water sharks -- including the great white and hammerhead -- face extinction, according to a major conservation survey released Thursday.</p>