Paleontologists have unearthed a stunningly complete fossil of the oldest dome-headed dinosaur, a pachycephalosaur, from the Gobi Desert in Mongolia. This remarkable specimen, estimated to be 108 million years old, is not only the most complete fossil of its kind ever found, but it also sheds light on the behaviors of these ancient creatures. Researchers believe that dome-headed dinosaurs, known for their distinctive features, might have practiced headbutting for social interactions, particularly in attracting mates. This discovery is considered a once-in-a-lifetime find that enhances our understanding of dinosaur evolution and behavior.