How do you create dinosaur noises without knowing what dinosaurs sound like? In this video, sound designers Pete Horner and Al Nelson explain the story behind the sound effects of Jurassic World. For the newest instalment of the Jurassic Park films, the sound team recorded a variety of animals from the guttural sounds of the walrus, beluga whale, lion and pig to the screams of the dolphin, spider monkey and fennec fox. Sounds of high frequency were blended together to achieve the high squealing sounds of each dinosaur; furthermore, they had to ensure that each species sounded distinct from one another. Check out the interview above.