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Phorusrhacids and dinos



I'm horribly out of touch with the current understanding of the
relationship of theropods to the great flightless predatory birds of the
Tertiary. At what point do we begin to see beaks replace the toothy jaws
of most of the theropods? Oviraptorinae? Ornithomimidae? Both of those
groups are usually considered nonpredaceous, right? So when do we see
true raptorial beaks make an appearance?
-Chris Srnka