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Re: Just this n that

In a message dated 97-03-18 14:39:00 EST, th81@umail.umd.edu (Thomas R.
Holtz, Jr.) writes:

<< 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