PHOTOS: Sharks Swim Towards Extinction

Study finds three shark species to be on the brink of extinction.

PHOTOS: Sharks Threatened by Fin Soup

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The silky shark has a typical large shark body, but is slim with silky smooth skin. The shark is amongst three species recently listed as vulnerbale to extinction by the International Union for the Conservation of Nature. (Brian Skerry/National Geographic/Getty Images)
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