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>From: Mike Bonham <firstname.lastname@example.org>
> Lets see where this takes us:
> In the early Jurassic, a branch of the theropods evolves feathers and flight,
> producing birds. One branch of early birds GIVES UP flight, producing
> Archaeopterix and evolving into more highly developed flightless maniraptoran
> dinosaurs. ...
> Thus, in this
> scenario you could say Tyrannosaurus evolves from birds!
> Is there any plausibility to this idea?
It's been suggested before, by George Olshevsky.
He resolves the resulting taxonomic issues by restricting Aves
to the carinate birds (= Neornithes??). That way Tyrannosaurus
remains a dinosaur, not a bird.
The peace of God be with you.