With that knowledge, Julia Clarke, a paleontology professor at the University of Texas, decided to create a more accurate depiction of the noise the T-Rex probably made. The researchers describe it as a low rhythmic thud, similar to the sounds you often get in horror movie music, because low-frequency noise, which is often felt as well as heard, is more frightening, or even potentially paralyzing, than high-frequency noise. By combining the booming call of the Eurasian bittern with the growling vocalizations of the Chinese crocodile, and then scaling it up to T-rex’s estimated size (about 12 meters or 40 feet long), what they got was a terrifyingly ominous low rumble that raises the hair on the back of the neck. It was probably audible from miles away. Before it grew up into the biggest Tyrannosaurus, the baby T.rex was actually adorable. The iconic T. rex roar was created by playing with the speed and frequency of elephant and dog sounds. Call of the Tyrannosaurus Rex. We are no longer supporting IE (Internet Explorer). We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. However, her original roar from Jurassic Park did not go unused. Julia studies dinosaurs’ closest living relatives—the reptiles—to figure out the kinds of sounds they could have made. The T.rex. But experts know that the T-Rex and its fellow dinos weren’t closely related to predatory mammals, like lions, bears, and wolves, that make roaring sounds today. Sign up today to get weekly science coverage direct to your inbox. But what did it sound like? Alastair takes you through what the Tyrannosaurus Rex ACTUALLY sounded like. This is how we meet Tyrannosaurus rex in the classic 1993 film Jurassic Park, based on Michael Crichton’s 1990 novel of the same name. But what did it sound like? Did you know that the Earth itself actually makes a sound? I Paid $40 for a Salt Container. When watching Jurassic Park, what do you think is more frightening, Tyrannosaurus rex ’s ear-splitting roar or the anticipatory low, rumbling thud of its footsteps? Aiming to explore the “astonishing truth” about everyone’s favorite fearsome creature after years of misrepresentation by pesky Hollywood studios (to quote Jurassic World: "This creation exists to fulfill a corporate mandate – they want something bigger, louder, with more teeth.") Meghan Jones is a Staff Writer for RD.com who has been writing since before she could write. But is what you're imagining right now really what the prehistoric beast looked like? General T. rex Facts. Since the T-Rex is one of the most famous predators to ever live, film sound designers naturally gave it a classic “predatory” roar. Take a listen to the sound on Telegraph UK. SAHACHATZ/Shutterstock. Oh please, roaring is so 2017. Tyrannosaurus Rex had a massive skull that was around 5 ft in length. 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