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Re: Just this n that



> << Birds seem to be unique among
>  vertebrate flyers and gliders in that there is no evidence of a typical
>  flat-bodied gliding stage in their evolution. >>
> 
> The retroverted pubis of dromaeosaurids can be considered evidence of such a
> stage.


I don't think dromosaurids are as flat-bodied as what Tom is referring
to.  
I think he's thinking of animals that are more parallel to the ground
(and thus having a body in a plane to glide in naturally) than any
bipedal dinosaur OR bird has been.
-- 
           Betty Cunningham  
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