A new study published Wednesday in the journal Nature sheds some new light on how that came to be, and the research behind it has a whole lot to do with one thing: fossilized dinosaur poop.

And the rise of the dinosaurs to a dominance that lasted 165 million years has now been charted… in the fossilized poop and puke they ... what they may have looked like, how they lived, and ...

A chicken-sized dino, the oldest known in North America, has thrown a wrench in the widely accepted timeline of early dinosaur history.