Quote:
Originally Posted by winkosmosis
Birds have feathers because you can't grow smooth plastic sheets
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Bats, pterodactyls, dragonflies, and more, all with wings that are arguably smooth "plastic".
Borrow a stereo microscope, and take a good look at the small-scale structure of a feather. Then try to figure out how to build something with the strength/weight ratio of a wing primary feather out of a smooth plastic sheet...