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Old Sep 05, 2011, 09:15 PM
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Build straight - Fly twisty
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Australia, QLD, Little Mountain
Joined Feb 2010
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Further to this I searched 'vulture in flight' in Google Images.
There is nothing there that looks to me like a stepped wing section.
But Dragonfly wings are another thing altogether:
http://jeb.biologists.org/content/203/20/3125.full.pdf
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