Dinosaurs died out 65 million years ago. We don't really know what they sounded like. There are many movies with dinosaurs making all kinds of roars and screams, but these noises are just guesses that movie directors make. A new discovery has given scientists a better idea of what dinosaurs sounded like. The scientists examined a rare fossil from a dinosaur called an ankylosaur. The fossil is 78 million years old. It includes a record of the ankylosaur's voice box. The scientists think the shape of the creature's voice box means it probably made bird-like sounds.

The research was led by a dinosaur researcher at the Fukushima Museum in Japan. He did many tests on the shape of the fossilized voice box. He compared it with the voice box of birds, crocodiles and turtles. He now has an idea of what the voice box muscles looked like. The muscles controlled the sounds of the voice box. The research may mean that movies like Jurassic Park got it wrong. Tyrannosaurus rex probably made more of a tweeting sound, like a bird. Hollywood may have to change its scary roars in future dinosaur films to a tweet-tweet sound.