Re: Re-emergence of lost features.

[Betty Cunningham <bettyc@flyinggoat.com>]

> John V Jackson wrote:
> I suspect two barriers to re-evolving good hands: In flying forms,
> developing clawed hands and fingers would tend add weight and spoil
> the aerodynamic properties before they lent any other advantage. 

of all flying vertebrates, birds are the only ones that do not have
clawed fingers on their hands-both bats and pterosaurs do (or did).