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feather symmetry

Tracy Ford wrote:

>>That makes the *symmetrical* feathers on _Protoarchaeopteryx_ a bit 
>>difficult to fathom, doesn't it? 
>>Ilja Nieuwland
>Not if it was a swimmer...

Wouldn't asymmetrical feathers be just as useful for hydrodynamics as they 
are for aerodynamics?  Anyone know if penguin feathers are symmetrical?

                                                                Bill Adlam