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Making America's Best Idea Even Better
National Park ServiceMatt Bransford leading a group into Mammoth Cave, circa 1920
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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.

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Last Updated: July 24, 2006 at 22:37 EST