Habitat: Pachycephalosaurus lived in what is now North America during the Late Cretaceous Period, approximately 65 million years ago. It roamed the ancient forests and plains of present-day Montana, South Dakota, and Wyoming.

Appearance: Pachycephalosaurus was a large dinosaur, measuring about 15 feet in length and weighing up to 990 pounds. Its most distinctive feature was its thick, dome-shaped skull, which could be as thick as 10 inches! Its body was relatively small compared to its head, with a long tail for balance.

Diet: This dinosaur was primarily herbivorous, meaning it mainly ate plants such as leaves, ferns, and possibly fruits. Its sharp teeth were adapted for shredding tough plant material.

Fun Fact: Pachycephalosaurus is best known for its thick skull, which was likely used for head-butting contests with rivals during mating season or to establish dominance within its social group. Some scientists believe that the skull may have also played a role in thermoregulation, helping the dinosaur to regulate its body temperature.

Discovery: The first Pachycephalosaurus fossils were discovered in Montana, USA, in the late 1800s. Since then, more fossils have been found in various locations across North America.

What Happened to Them: Like many other dinosaurs, Pachycephalosaurus became extinct around 65 million years ago, possibly as a result of a catastrophic event such as the asteroid impact or volcanic activity.