T. Rex Had Scaly Lips Covering Enormous Teeth, New Study Shows.
A new study in the journal Science suggests that Tyrannosaurus rexes could have had thick, scaly lips covering their teeth, similar to modern Komodo dragons, rather than exposed choppers. Paleontologists are still debating whether T. rexes' teeth were hidden or not, but hope to find more fossils, including dinosaur mummies, to settle the debate.