Pachycephalosaurs are members of the dinosaur clade Pachycephalosauria, characterized by their unique, thickened skull roofs. These "bone heads" walked on two legs and are thought to have used their domed crania in social behaviors such as head-butting for dominance or mating rights. Their fossil record primarily spans the Late Cretaceous period, and they are known for some of the most distinctive skull fossils among dinosaurs.
- Thick, domed skulls (some up to 25 cm thick) are their hallmark.
- They were bipedal ornithischians (bird-hipped dinosaurs).
- Lived mainly in the Late Cretaceous (about 100-66 million years ago).
- Fossils are mostly found in North America and Asia.
- Likely used their thick skulls for intraspecific combat or display.
Pachycephalosaurs are defined by their thick, domed skulls.
Pachycephalosaurs primarily lived during the Late Cretaceous.
Pachycephalosaur fossils are mainly found in North America and Asia.
The thick skulls of pachycephalosaurs are hypothesized to be used for head-butting and display.
Pachycephalosaurs are ornithischians, or 'bird-hipped' dinosaurs.