|Dec 06, 2013, 09:35 AM|
Joined Apr 2006
I finally figured out why the tips [and length] of Kiki's long tail feathers describe ovals when he is flying FAST and doing abrupt flight corrections:
since he steers by pushing harder with one wing -- and since like ALL birds his wing motion is this "aerowing" -- the long tail feathers are forced to oscillate in sympathy with
the harder-"rowing" wing!
I assume both aerodynamic [vortex] and mechanical induction for this phenominon. Further, as I have noticed this in videos of other birds with long tail-feathers, I might guess that this is also a kind of visual warning, etc., of such abrupt flight-direction change.
Or it could have no meaning, just what happens ....
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