With a name that literally means “thick-headed lizard,” Pachycephalosaurus is famous for the bowling-ball dome on its skull—up to 25 cm of solid bone. Living in Late Cretaceous North America about 70 million years ago, this herbivore reached up to 4.5 meters long and probably used its reinforced noggin for shoving matches, intimidation displays, or simply walking around looking perpetually unamused. While scientists debate whether they butted heads like bighorn sheep or just body-checked each other in the ribs, one thing’s clear: this dinosaur had the ultimate built-in helmet. This hard enamel pin captures its domed head and stocky profile in polished metal and enamel—no fossil quarry required.nSpecs:nnPremium metal base with polished hard enamel fillnSecure clasp so your Pachy doesn’t “headbutt its way free”nSize: 43 x 21mmnZero risk of denting your furniturennPerfect for dinosaur fans, paleontology enthusiasts, and anyone who enjoys creatures that weaponized their own skulls.