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http://www.berkeley.edu/news/media/releases/2009/10/30_dino_demise.shtml

New analyses of dinosaur growth may wipe out one-third of species


Not three different species, but stages of the same species.
Image: Holly Woodward/Montana State University

New analyses of North American dome-headed dinosaurs by paleontologists from the University of California, Berkeley, and the Museum of the Rockies has suggested that one-third of all named dinosaur species may never have existed, but are merely different stages in the growth of other known dinosaurs.