The research is the latest in a long back-and-forth over how dinosaur mouths really looked.
whose teeth stick out of its mouth, the exposed part gets worn down quickly — "like someone’s taken a sander to the side of the tooth," said another study author Mark Witton, a paleoartist at England’s University of Portsmouth.
But when researchers analyzed a tooth from a Daspletosaurus, a T. rex relative, they found it was in good condition and it didn’t show that uneven damage pattern. Actor Sam Neill as Dr. Alan Grant takes on a Tyrannosaurus Rex in a scene from the film 'Jurassic Park', 1993. With this evidence and other clues from the dinosaurs’ anatomy, the study makes a good case for lipped tyrannosaurs, said University of Maryland paleontologist Thomas Holtz, who was not involved with the study. Still, "we’re not talking kissy lips," he pointed out — they'd be thin and scaly like those of the Komodo dragon, a large lizard.
It’s not the first time our depictions of dinosaurs have been called into question: Other research has shown that T. rex was more hunched over than we used to think, and that fierce velociraptors probably sported feathers. Most of what we know about dinosaurs comes from their bones, but it can be harder to get clear answers about soft tissues like skin, which usually aren't preserved as fossils.
Adding lips may make dinosaurs look a little less ferocious, but it also makes them feel more realistic, Witton said.
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