A research team said it has discovered the oldest known pachycephalosaur, the so-called head-butting group of dinosaurs ...

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

"Pachycephalosaurs are iconic dinosaurs, but they're also rare and mysterious ... while others suggest that these weirdos didn't butt heads, but instead kick-boxed like kangaroos. But how their ...

An international team of scientists says it has found a fossil of a new species of pachycephalosaur, a type of dinosaur known for their dome-shaped skulls.

When did these blockhead dinosaurs get their domes? A new fossil is “the specimen we have all been waiting for.” ...

Researchers said the fossil represents a juvenile of a previously unknown species they have named Zavacephale rinpoche.

It is remarkable for being the oldest definitive pachycephalosaur, pushing back the fossil record of this group by at least 15 million years, but also because of how complete and ...

Pachycephalosaurs, two-legged plant eaters known for their bony dome-shaped skulls, are among the quirkiest dinosaurs known, and also among the least understood. A fossil found peeking out of a cliffs ...

A fossil from Mongolia’s Gobi Desert reveals Zavacephale rinpoche, the oldest and most complete pachycephalosaur ever found.

In this artist's reconstruction, two pachycephalosaurs from the new species Zavacephale rinpoche spar, engaging in head-butting behavior that some researchers theorize may have been the purpose for ...