"First, membranous wings are very rare, and occur only in pterosaurs and bats. No intermediate forms have ever been found leading up to these organisms. No half-membranous wing has ever been found. Evolutionists explain only the existence of fully formed membranous wings, but their explanation as to how they arose in the first place is not convincing."Flying squirrels type flight and membranes, have evolved independently half a dozen times in mammals. Is he saying is unconvincing the notion that bats may descend from gliders?
Second, if the evolution of membranous wings were so straightforward, then it is hard to understand why they didn’t evolve more times, since these kinds of wings make flight just as efficient as bird wings. For example, bat wings have even more joints in their hands than humans, giving them fine control during flight. Bats’ many-jointed wings provide for more lift, less drag, and more maneuverability.What's quickly evident when around flying bats is that they are less powerful than birds and can't gain altitude fast.