Popular depictions of the superpredator Tyrannosaurus rex snarling to display its gigantic, knifelike teeth are scientifically inaccurate, new research suggests.
Theropod dinosaurs — a group of bipedal, mostly meat-eating dinosaurs that included T. rex, Velociraptor and Spinosaurus — may instead have concealed their deadly chompers behind thin lips that kept their teeth hydrated and tough enough to crush bones.
