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more>Park of the day:
Mammoth Cave National Park
Beneath the sandstone-capped ridges of Mammoth Cave National Park lies the largest known cave system on Earth -- although its full extent remains a mystery.
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Can you tell a twitter from a tweet? A warble from a gobble?
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Bird of the Day
Common Nighthawk
This bird has moved into towns and cities, where flat roofs provide abundant nest sites, and railroad yards, vacant lots, and sports fields offer good feeding opportunities. read more
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