When I was an undergraduate student our mammology class went out for a lab class one night to a nearby cave. It was home to quite a few bats (many thousands) including gray bats. One part of the trip was to climb up into a gray bat nursery chamber. We had to climb/crawl up a very steep slope on our hands and knees in what were basically knee and hand holds worn into wet packed clay.
It wasn't until we got to the top that we came to understand that wasn't clay we were crawling through...
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George
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"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. It is it’s natural manure."
Thomas Jefferson, 1787
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