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