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Ratite Evolution ?

With recent discoveries and discussion of avian dinosaurs,
flightlessness,etc, our widened conception of dinosaurs to include birds,
is it not time to re-define "birdness" ?  Is Aves still valid ?  Is it a
polyphyletic grouping resulting from different birdlike dinosaur ancestors
? Do birds have a common ancester ? Are ratites, and kiwis actually birds
at all ?