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| Today we went to Wind Cave National Park to earn junior ranger badges and hike. Then we went to Mount Rushmore and earned another junior ranger badge. |
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| Wind Cave has a small population of bison but plenty of prairie dogs. We walked to a prairie dog town and sat in the grass for 20 minutes to observe the prairie dog behaviors. We saw canyon wrens This is a lonely bachelor bison. |
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| Later in the afternoon we had a 2 hour tour of Wind Cave. |
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| These are boxwork configurations which are common in Wind Cave but rare elsewhere. This cave is a dry cave. The boxwork are thin sheets of calcite that form a honeycomb pattern. Some are as thin as paper. Others are so thick it would take a hammer to break them. |
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