A new study in the journal Science is challenging some of the best-known depictions of dinosaurs in television and movies, saying the T. rex family had scaly lips covering their teeth.

Similar to humans, the T. rex had lips that concealed its teeth, a stark contrast to popular, toothy depictions of the dinosaur we’re accustomed to in monster movies, a study published Thursday ...

T. Rex Had Lips That Concealed Its Teeth, Study Says Paleontologists say popular, toothy depictions of the dinosaur may have missed the mark. Alex Chun - Staff Contributor. March 31, 2023.

This suggests that lizard-like lips covered their teeth. If we’re right, and lizards are our best model for theropod mouths, dinosaur lips were probably not muscular, like mammal lips are.