ScienceDaily Posted June 5, 2015 Share Posted June 5, 2015 Birds use a thumb-like structure on the wing to create a small vortex which makes their turns and landings smooth, new research shows. This is the first time that researchers have found evidence that the effect of the alula is due to a small vortex formed at the tip of the alula feathers. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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