There was one oddity in the study Clarke couldn't explain. Armored dinosaurs—like a stegosaurus or ankylosaurus—also had complex hyoids, even though they were very different animals than winged dinosaurs. Clarke says she's also unsure what purpose the rooted tongue of a T. rex would have served, but based on observations of crocodiles—which have a similar simple hyoid bone—it had something to do with food. A flat tongue certainly makes sense for a crocodile, which swallows prey whole—a long, bony tongue would probably interfere with that. Or maybe the tongue was always meant to be a landing strip for the bright, blue birds that pick leftover meat out of crocs' teeth. Either way, tongues can tell us a lot more than we thought.