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Re: Moasaurus

>> If certain birds did become secondarily flightless,
would we mistake them for nonavian dinosaurs? <<
If you subscribe to HP Greg Paul's theories, yes.  Predatory Dinosaurs of the
World advocated the notion that the dromaeosaurs were likely flightless birds of
prey, descended from flighted birds very much like Archaeopteryx or Rahonavis
(birds that had not lost teeth, tails, or feathers).