Fossilized dinosaur feces and vomit help scientists reconstruct the creatures' rise

Scientists are using used fossilized feces and vomit from Poland to reconstruct how dinosaurs came to dominate the Earth. The new study reconstructs who was eating whom 200 million years ago and suggests that dinosaurs ascended to prominence in a series of steps over 30 million years. The first dinosaurs ate whatever they could — including insects, fish and plants, and adapted quickly when climate conditions changed. The study was published Wednesday in the journal Nature and the findings were limited to Polish fossils.