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Triassic radiation

230 mya the Pterosaurs, Dinosaurs, Birds (if you believe that Protoavis may
the the precursor for aves) and mammals evolve . Some dynamic has to be at
work here, other than the Permain-Triassic extinction event.
    Endothermy or at least experiments in warm blooded physiology would be
the logical trigger for such a remarkable radiation of fundamentally
different forms at this time.
    Any thoughts on this out there?