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Fact: Jurassic Park remains one of the best movies of all time and holds up incredibly well. (Also, Probably) Fact: The movie has a skewed depiction of the noises made by dinosaurs. Director Steven Spielberg and his sound design team combined sounds from elephants, alligators, and tigers to bring those dinosaurs to life. However, many dinosaur experts believe that these terrible lizards were not capable of producing such noises.
So what did they sound like in real life? It's difficult to say. Paleontologist Phil Senter has studied the distant descendants of dinosaurs in the hopes of gaining some insight. Some 66 million years ago, most dinosaurs were wiped out in what's referred to as the K/T Extinction event. A small fraction survived and from those eventually came our modern species. Ten million years after the K/T Extinction event, the first shared ancestor of the modern crocodile evolved. Our best hope for understanding the vocal capabilities of dinosaurs is to study crocodiles and birds. Yet, according to Dr. Julia Clarke at the University of Texas, Austin, the organs in both of these animals after this mass dinosaur extinction.
Still, there's fossil evidence indicating that dinosaurs were capable of making some kind of noise. Many dinosaurs had nasal cavities, which formed a resonance chamber. This enabled them to produce some sound-most likely low frequency noises similar to an elephant.
The Animals Hiding in a T. Rex's Roar (Scientific American)
"If you made it to the recently re-released 3D edition of Jurassic Park, you're going to hear a dreadful sound that terrified audiences two decades ago. Tramping through the rain and the mud, the tyrant lizard bursts onto the screen and bellows a soul-shuddering shriek."
How Did Dinosaurs Communicate? (Live Science)
"Dinosaurs definitely didn't have email and text messages to keep in touch with friends, but scientists are quite certain that there was dialogue among the beasts."