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Re: BAAD BCF



>In MM #2 I hypothesized the tail-glider and the canard-wing glider as stages
>in the evolution of gliding flight. Tail-gliders evolved first, using only
>the tail to provide direction and stability to the trajectory, which would
>have been little more than a controlled leap. Then the outstretched forelimbs
>would naturally acquire airfoil surfaces as improvements to solving the
>trajectory-control problem. As you suggest, there is no reason the forelimbs
>and their airfoils need to become large surfaces for gliding before going on
>to powered flight. Gliding in extant large birds is almost certainly a
>secondary adaptation of flight. Your stuff makes sense.

How does the evolution of the patagium (the flap of skin covering the forearm, 
forming the airfoil shape) fit in with all of this?  Perhaps explaining how 
that evolved could help us solve this riddle?

Rob

***
Labrynthodonts: Amphibians that lived with the Minitaur!