Age: Extinct, since the Late Cretaceous. Appearance: Thick-headed dinosaur, hence the name, which means “thick-headed lizard”. Thick-headed as in stupid? Well, they weren’t clever, but it’s really because they had spiky, domed skulls to protect their tiny brains. They’re dinosaurs. What else are they like? Socially aggressive, accidentally racist. How can a dinosaur be racist? It’s due to their appearance in the blockbuster Jurassic World. From what I’ve seen, the dinosaurs in Jurassic World are equal-opportunity devourers. True, but early on in the film, after some pachycephalosauruses have escaped their sector, a character utters the line: “The pachys are out...