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Vetstreet: 20 Animals You Might Not Know Are Going Extinct

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Many people don't even think of corals as living creatures, but they are key to the survival of entire ecosystems. Elkhorn and Staghorn stony coral species are the first coral organisms to be added to the Endangered Species Act and are currently classified as "threatened." Staghorn coral, or Acropora cervicornis, has lost 80 to 90 percent of its reef populations around the world in the past few decades.

(Credit: Thinkstock)

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