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Re: Science feather strength debate

 The asymmetrical vanes of the remiges and rectrices of
 _Archaeopteryx_ suggest some kind of aerial capability. But not
 necessarily powered flight, because _Microraptor_ has them too.

Of course, the only argument against *Microraptor* being a powered flier is the same one that holds for *Archaeopteryx* and *Confuciusornis*: its shoulder joint.

 However, some flightless birds retain asymmetrical vanes (e.g.,
 flightless grebes)

Oho. Reference, please?