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Progressive birdyness?

     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.
LN Jeff