Dinosaurs first appeared around 230 million years ago, coexisting with large crocodile relatives and massive herbivores.

NEW YORK — Using fossilized feces and vomit samples from Poland, scientists have reconstructed how dinosaurs came to dominate the Earth millions of years ago. Researchers aren’t sure whether ...

Fossils from the age of dinosaurs are an irreplaceable window into a time when these ancient creatures roamed the Earth. These remains, including bones, footprints and even fossilized feces ...