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Mammoth Cave National ParkPetroglyphs at Devil's Looking Glass in Mammoth Cave - their meaning has never been conclusively deciphered
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Mammoth Cave National Park
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Eyeless cave fish  

Did You Know?
Creatures that spend their entire lives in Mammoth Cave adapt to the dark world. Some types of cave fish, for example, do not grow eyes – supporting these extra unnecessary organs would consume precious energy in their nutrient-poor environment.

Last Updated: February 24, 2009 at 10:52 EST