From the creationist website you linked to.
quote:
Moreover, just having wings is not sufficient for a land organism to fly. Land-dwelling organisms are devoid of many other structural mechanisms that birds use for flying. For example, the bones of birds are much lighter than those of land-dwelling organisms. Their lungs function in a very different way. They have a different muscular and skeletal system and a very specialised heart-circulatory system. These features are pre-requisites of flying needed at least as much as wings. All these mechanisms had to exist at the same time and altogether; they could not have formed gradually by being "accumulated". This is why the theory asserting that land organisms evolved into aerial organisms is completely fallacious.
I wonder how bats compare as far as these "pre-requisites" are concerned. Anyone here knowledgable on this subject? How do bat lungs compare to bird lungs?
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