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

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

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

Grand Teton National Park on Wednesday shared images of bison “turning up the drama” during the ongoing bison rut. The rut, also in progress in neighboring Yellowstone National Park, occurs in July ...