To account for the numerous gaps in the fossil record, they treated the parts of the world where fossils have not been ...

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.

But they weren't interested in the dinosaurs' bones. Instead, they looked at the dinos' fossilized vomit and poop — known as regurgitalites and coprolites, respectively. These can provide vital ...

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

The dinosaur was about as big as a Tyrannosaurus rex and had a unique nasal horn and symmetrical teeth that it used to eat ...