Dinosaur Dung, Vomit Offers Clues to Their Rise NewserFossilized poop offers clues into the rise of dinosaurs more than 200 million years ago USA TODAYDinosaur Domination Is Marked in a Timeline of Vomit and Feces Fossils The New York TimesFossilized dinosaur feces and vomit help scientists reconstruct the creatures’ rise The Associated PressFrom fossil dung, scientists reconstruct the rise of the dinosaurs The Washington Post