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. PTN |