The narrator introduces the Pachycephalosaurus, describing it as the largest bone-headed dinosaur. They explain its features, historical period, and the old theory that it used its dome-shaped skull for head-butting, comparing it to bighorn sheep. The video then debunks this theory with new research and proposes alternative uses for the skull, such as species recognition or flank-butting, similar to modern bison.
Transcript
Meet Pachycephalosaurus wyomingensis, the largest bone headed dinosaur ever found. This herbivore lived some sixty six million years ago during the late Cretaceous and is part of the group of dinosaurs known as pachycephalosaurids, which had distinctive heads with high round skulls. Pachycephalosaurus had around 10 inches of bone crowning its brain. Scientists once thought that these dinosaurs yes their dome shaped skulls for head better, not unlike modern day bighorn shape, but research has has since overturned this idea by suggesting the bone was too weak to withstand head on blows. Instead, their distinctive heads may have been used to help members of the same species recognize each other and compete for mates. If males fought with their heads in contests for females, they may have hit opponents on their sides much as modern bison do.