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Saurischian birds

I'm sure this is a simple question, but one that has puzzled me for some time, I cannot find any simple answer.
If we can easily divide Dinosaurs into Saurischia (lizard-hipped) and Ornithischia (bird-hipped), is there a problem with stating that birds have evolved from the Saurischian Therapods?
I don't doubt myself that the two groups are related, but perhaps the birds evolved in the early Triassic as well, and from there there has been a lot of cases of parralel evolution.
If not, at what point did birds change from being Saurischians to Ornithischians?
I don't have access to scientific journals, I wish I did. Instead I have this mailing list :-)


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