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Re: Best _Guanlong wucaii_ headline

Another member recently  noted the presence of a semilunate carpal.
After reading "Dinosaurs of the Air",  that feature makes it  highly
likely arm feathers were present, necessitating the need for a way to
fold the feathers out of harm's way when not in use

It might be the other way around. A semilunate carpal may be a prerequisite for the evolution of wing feathers because a wing that could not be folded out of harm's way would have little or no adaptive advantage (especially in sexual selection). I have not done any experiments or math on this; I'm just mentioning the existence of an alternative just-so story.