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Re: Comments on _Longisquama_ in _Science_.
<That's important, Ruben says, because he and most other scientists think
structures as specialized as feathers must have evolved only once, almost
certainly in some ancient member of a vast group of creatures called
Hmmm. But according to Ruben, Martin, Feduccia, et al. the skeleton of a
theropod and a bird could evolve twice while looking so similar and sharing
so many osteo characters? This statement about feathers evolving only once
would seem inconsistent with their previous statements on convergence of
body plans. Furthermore, one could argue (as has been done, although I
forget the reference) that endothermy evolved only once since it is also
very complicated and yet it appears that mammals and birds (and perhaps
dinosaurs and pterosaurs) all developed it. So again, to be consistent,
feathers or feather-like structures could have evolved more than once.
"... Hey mighty Brontosaurus don't you have a lesson for us? / Thought your
rule would always last / There were no lessons in your past / You were built
three stories high / They say you would not hurt a fly / If we explode the
atom bomb / Would they say that we were dumb? / We're walking in your
-- The Police, "Walking in Your Footsteps"
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