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A robot that looks like a pigeon and can make tight turns like real birds may point to the future of aerospace engineering a continuously morphing(变形)wing. Understanding exactly how birds fly has always been diffi- cult.To learn more,David Lentink at Stanford University in California and his colleagues first looked at the wings of a pigeon body.Each wing had 40 feathers,20 on the upper side,and 20 on the lower."We attached a marker onto each individual wing and we were able to carefully measure the relationship between feather motion and bone motion,says Lentink."We then just moved the wing,in and out. They found that the wrist angle determined the angles of all