Pachycephalosaurus was a genus of ornithischian dinosaur that thrived during the Late Cretaceous period (approximately 76 to 74 million years ago) in what is now North America. Its name means "thick-headed lizard," a reference to its most distinctive feature: a massively thickened, bony dome on its skull.
Physical Characteristics: The most notable feature was the extremely thick skull dome. This dome could be up to 25 centimeters (10 inches) thick and was composed of dense bone. This dome structure is a key topic in the discussion of Pachycephalosaurus%20Behavior.
Size and Build: Pachycephalosaurus was a relatively large bipedal dinosaur, estimated to have reached lengths of up to 4.5 meters (15 feet). It had a relatively small, slender body and powerful hind legs. Its arms were short, and it likely used its tail for balance.
Habitat and Distribution: Fossil evidence suggests Pachycephalosaurus inhabited forested or open woodland environments of western North America.
Diet: Pachycephalosaurus was likely an herbivore, feeding on plants. The exact type of plants it consumed is unknown, but it may have preferred soft vegetation due to its relatively small teeth. The Pachycephalosaurus%20Diet is still subject to research.
Skull Dome Function: The function of the thick skull dome is debated. The two main hypotheses are:
Classification: Pachycephalosaurus is the type genus of the Pachycephalosauridae family, which includes other dome-headed dinosaurs. The Pachycephalosauridae%20Family has many similar but distinct members.
Fossil Discoveries: The first fossil remains of Pachycephalosaurus were discovered in the late 19th century, but it was not until the mid-20th century that its significance as a distinct genus was fully recognized.
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