Dinosaurs died out 65 million years ago. We don't really know what they sounded like. Movies show dinosaurs making all kinds of roars and screams, but these are guesses, not real. A new discovery gives us a better idea of what dinosaurs sounded like. Scientists examined a rare, 78-million-year-old fossil from a dinosaur called an ankylosaur. The fossil has an image of the ankylosaur's voice box. The shape of this means it probably made bird-like sounds.

A dinosaur researcher in Japan did many tests on the shape of the fossilized voice box. He now has an idea of what the voice box muscles looked like. The muscles controlled the sounds. The research may mean that movies like Jurassic Park got it wrong. Tyrannosaurus rex probably made a tweeting sound, like a bird. Hollywood will have to change the roars in future dinosaur films to a tweet-tweet sound.