I must comment one more time....
Tim Williams wrote (summarizing my posts)
>(2) Aerial locomotion: The "swivel wrist" was evolved for orientational
control (steering and stability) during aerial descents.<
Tim, that is not at all what I'm saying. I'm talking only about evolution of aerodynamic orientational control in cursorial animals.
>(2) holds that secondarily non-aerolocomotive<
Aarrghhhhhhhhhh! One more time, I am NOT talking about a secondarily flightless condition! My premise is that the avian folding wrist evolved in cursors as an advancement for aerodymanic control when moving quickly >on the ground<. Please stop restating my position if you insist on getting it wrong.