> Regarding life in trees, how good a glider can *Archaeopteryx* have > been when it had that gap between wing and body, and don't > chachalacas have a fully reverted hallux while that of > *Confuciusornis* points medially and that of *Archaeopteryx* isn't > rotated at all? Oho! So now the poor thing cannot even glide?
I don't know, I haven't done the math.