Summary:
- Researchers have discovered a well-preserved fossil of a pachycephalosaur, a type of dinosaur known for its thick, dome-shaped skull.
- The fossil, which includes the dinosaur's skull and partial skeleton, was found in Montana and is estimated to be around 75 million years old.
- Pachycephalosaurs were herbivorous dinosaurs that lived during the Late Cretaceous period and were known for their unique head structures, which may have been used for head-butting behavior.