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Re: Progressive birdyness?



In a message dated 97-05-09 17:52:50 EDT, martz@holly.ColoState.EDU (Jeffrey
Martz) writes:

<< Can anyone tell be if dromeosaurs and troodontids showed a tendancy
 to get more birdlike with time?  Is _Velociraptor_ more birdlike the
 _Deinonychus_?  Are Late Cretaceous troodontids more birlike then earlier
 ones?  If so, it would be a rather puzzling trend considering birds
 evolved in the Jurassic. >>

I've found no real evidence of such a trend, and I suspect it's because the
common ancestor of dromaeosaurids diverged from the theropod-to-bird lineage
earlier than the appearance of _Archaeopteryx_. Its descendants set
themselves up as a clade of carnivores that lasted to the end of the
Cretaceous.