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Beautiful image!
I wonder what happened to the left wingtip, it seems to be clipped?
Thanks!
AFAIK the feathers on a swallow’s wing are variable geometry - the angle of sweep varies with speed (that is, the wings are swept back for speed) and turn (like the ailerons on an airliner, that prevent the plane from yawing in a rudder-only turn). I was too absorbed in following this guy to take notes on his sequence of moves, and lost him in the next frame.