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Originally Posted by blankall
Stuff like this is always pretty facinating. The thing that got me was how do entirely new structures evolve on a more complex level. For instance, some insects growing wings. What use are part of a wing? Things like lizards learning to fly over time makes sense because already useful structures are being adapted to new uses, but entirely new structures is a little harder to explain.
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Well if it can help something jump further, or fall less quickly, or hold onto branches in strong winds better.. or anything really where it would give a survival advantage it would be selected for.
Flight's evolved separately four times that we know of, insects were earliest, but I don't think they know how it evolved as well as they do for birds.