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... "Rat urinite"

Dr. D. O. Emerson and I showed that in some locations the white spots on rocky cliffs, once thought to have been produced by owls and hawks, were primarily deposits of calcite formed over decades by woodrats scentmarking these territorial spots by repeatedly urinating on them.
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224B-rat-urinite

 

photo by Howdy Howard, published in Saved by Bedbugs (2004)
 
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