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Below is an example of how weird and rapid evolution can be. I have to wonder how often this has happened in the past and how invisible it would beto a paleontologist with nothing but hard parts as fossils and the lack of temporal resolution in the geologic record. This Mutant Crayfish Clones Itself, and It’s Taking Over Europe Carl Zimmer. New York Times, Feb. 2018 https://www.nytimes.com/2018/02/05/science/mutant-crayfish-clones-europe.html Decoding the mutant, all-female, self-cloning crayfish Kevin Bersett, University of Illinois, September 12, 2018 https://news.illinoisstate.edu/2018/09/decoding-the-mutant-all-female-self-cloning-crayfish The Genetic Mystery Of The Invasive Crayfish Clones, Science Friday https://www.sciencefriday.com/segments/the-genetic-mystery-of-the-invasive-crayfish-clones/ the paper is: Gutekunst, J., Andriantsoa, R., Falckenhayn, C., Hanna, K., Stein, W., Rasamy, J. and Lyko, F., 2018. Clonal genome evolution and rapid invasive spread of the marbled crayfish. Nature ecology & evolution, 2(3), p.567. https://forum.breastcarenetwork.com/wp-content/uploads/2018/02/Gutekunst-et-al.pdf https://www.nature.com/articles/s41559-018-0467-9 Maybe it is time for a crayfish broil. Yours, Paul H.