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Re: Senter 2006, Confuciusornis, and humeral mobility

On the subject of humeral mobility and powered flight, is it possible that
the first stages of flapping could involve flapping the wings downwards

In other words, on the lineage leading from a glider to a powered flier,
could the early stages involve gaining lift and extending glides by
flapping the arms from horizontal ventrally down to meet at the midline?

Then, in later stages of refinement, the recovery stroke could be added by
more complex shoulder modifications?