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  1. Ruby Falls: America's tallest underground waterfall

    Ruby Falls: America's tallest underground waterfall

    885
  2. Yellow spotted salamander makes dangerous trek once each year

    Yellow spotted salamander makes dangerous trek once each year

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  3. Scuba divers meet aquatic bird hunting thirty feet below the surface

    Scuba divers meet aquatic bird hunting thirty feet below the surface

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  4. These Marine Iguanas of the Galapagos are just like mini dinosaurs

    These Marine Iguanas of the Galapagos are just like mini dinosaurs

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  5. Breathtaking underwater springs reveal hidden geological wonder

    Breathtaking underwater springs reveal hidden geological wonder

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