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10 animals with the longest life spans

By: Bryan Nelson on Jan. 19, 2010, 1:31 p.m.
Ocean quahog

Photo: Hans Hillewaert/Wikimedia Commons

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Ocean quahog

The ocean quahog (Arctica islandica) is a species of clam that is exploited commercially. The dark concentric rings or bands on the shell can be used to determine the quahog's age, much like a tree has rings. Some collected specimens have been calculated to be more than 400 years old.