Memes

Wings evolve from legs though, generally speaking. This means that a four legged dragon with wings would have conceivably evolved from a six legged creature. You can get hand-wings or arm-wings, and we’re not entirely sure but think insect wings may have also evolved from legs or some other kind of similar structure.

But pretty much you can either have wings or legs/arms. You have to trade them in. That’s why the whole angel/demon thing doesn’t work either. The traditional harpies work but they’d be furry and not feathered. I haven’t worked out the wingspan for them but you could probably come up with a reasonable guess. They’d be more bat-people than bird-people, and I suspect that their chest areas would be less generously proportioned than is typically seen in the artwork. I’m not going more into the physics of that one though.