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Article by: JOHN NOBLE WILFORD , New York Times

Updated: October 3, 2012 - 9:36 PM

Not every dinosaur grew up to be a mighty predator like Tyrannosaurus rex or a hulking vegan like Apatosaurus. A few stayed small, and some of the smallest dinosaurs that ever lived -- tiny enough to nip at your heels -- were among the first to spread across the planet more than 200 million years ago.

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