How Do We Know What Dinosaurs Sounded Like?

Quick Overview

Scientists determine what dinosaurs sounded like by studying the vocal structures of their closest living relatives—birds and crocodilians—and reconstructing the likely vocal apparatus of dinosaurs like the Parasaurolophus, concluding that many dinosaurs likely produced low-frequency rumbles and bellows rather than high-pitched roars, similar to modern crocodilians.

Key Points: The roar used for the T-Rex in Jurassic Park (1993) is inaccurate because predators generally try to be silent when hunting, and the sound was likely a low-frequency rumble or bellow. The vocal structures (larynx vs. syrinx) in modern animals like mammals, crocodilians, and birds share the same underlying genetic pathways, suggesting dinosaurs likely had a vocal organ similar to the syrinx found in birds. Fossil evidence, such as the hollow, air-chambered crests found in dinosaurs like Parasaurolophus, suggests they used these structures as resonant chambers to create deep, bellowing sounds. The study of modern animals like crocodiles, elephants, and ostriches shows that low-frequency sounds are effective for long-distance communication, which would have been useful for large dinosaurs. The sounds dinosaurs made were likely closer to the low rumbles of crocodiles or the simpler calls of flightless birds like ostriches and kiwis, rather than the high-pitched sounds often depicted in media. Phylogenetic bracketing, comparing living relatives (birds and crocodilians) to dinosaurs, helps scientists make educated guesses about dinosaur vocalizations based on shared anatomical structures.

Context: The video addresses the question of how scientists determine the sounds dinosaurs made, contrasting popular cinematic depictions, such as the T-Rex roar in Jurassic Park (1993), with modern paleontological research. The analysis relies heavily on phylogenetic bracketing, comparing the vocal anatomy of modern animals closest to dinosaurs—birds (descendants) and crocodilians (closest non-avian relatives)—to infer the likely vocal capabilities of extinct species, noting that vocal structures like the larynx and syrinx share common genetic origins.