The sounds of the Dinosaurs you will hear in this video are close guesses. Scientists can't know for sure what dinosaurs sounded like, but they use a few clues to make educated guesses. Here are some ways:

Fossils: They examine fossils of dinosaur parts that might be linked to sound production, like the voice box (larynx).
Similar creatures: They compare dinosaur anatomy to living animals like birds and crocodiles, which are thought to be dinosaur relatives.
Body size: The size of a dinosaur's body can tell scientists how much air it could move, potentially influencing the sounds it made.