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Since people rarely try to cut down cell phone towers, after millions of years, as cell phone towers have gotten more treelike, trees have started growing fake cell phone tower attachments and shiny gray bark to protect themselves. This is a standard textbook example of convergent evolution.

"Magic Tree", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Since people rarely try to cut down cell phone towers, after millions of years, as cell phone towers have gotten more treelike, trees have started growing fake cell phone tower attachments and shiny gray bark to protect themselves. This is a standard textbook example of convergent evolution.