Add Yahoo as a preferred source to see more of our stories on Google. In this artist's reconstruction, two pachycephalosaurs from the new species Zavacephale rinpoche spar, engaging in head-butting ...

A remarkable fossil discovery dating back more than 120 million years has revealed the existence of a two-headed Hyphalosaurus, a small, long-necked aquatic reptile that lived during the Early ...

Add Yahoo as a preferred source to see more of our stories on Google. A new dome-headed dinosaur species was discovered in Montana, a study released this month shows. Researchers discovered the ...

Get any of our free daily email newsletters — news headlines, opinion, e-edition, obituaries and more. This fall, paleontologists officially welcomed the Thunderdome to Montana’s rich dinosaur history ...

A specimen discovered in Mongolia is the most complete fossil yet found of a pachycephalosaur, a dinosaur believed to be built for head-butting. The skull of Zavacephale rinpoche, a pachycephalosaur ...