I mentioned that I'm learning about the three different groups of vertebrates that evolved powered flight (pterosaurs, birds, bats).
Here is info about how birds do flight, including something I did not know -- look how the muscle that I think must pull the wings UP (supracoracoideus) goes around the front! I suppose this isn't a total shock, when you think about how little muscle there is across a chicken's back, but I am pretty sure I would never have guessed this design, if you'd asked me to guess before I saw this image!
This image was contributed to Wikimedia Commons by L. Shayamal. Thank you, L. Shayamal!
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