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> > > Could it be David that you have some particular motive for trying to
> > > _Archaeopteryx_ to the water...? ;-)
> > Sure! I can't explain the evolution of the wingstroke otherwise! :-)
> Generation of thrust, in a terrestrial cursor (a la Burgers and Chiappe,
I've read the Burgers & Chiappe paper. I think they make the same, erm,
improbable assumption as old Baron Nopcsa. Why does _no other_ terrestrial
cursor, including running birds, use this?
> or in an arboreal parachuter or glider.
Neither needs a wingstroke _for anything_.
> Either way, the wingstroke
> was co-opted from the predatory stroke.
Probably, but why was it exapted for anything at all? "That is the question