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Mother Nature has had a lot more time.
Animals' flight often amazes me. I remember reading that a dragonfly can fly in any direction (backwards, diagonally, etc.), can come to an instant stop, and can carry loads up to 40 times their own bodyweight. Helicopters look laughably primitive in comparison (actually, dragonflies can hover in one position, too - something very difficult to do with a helicopter). And, of course, they're very fast.