For decades, the sound of a dinosaur has been a baby elephant's roar mixed with an alligator's growl and a tiger's roar, thanks to the iconic Jurassic Park movie franchise. But this popular perception is now being challenged by groundbreaking research that reveals dinosaurs likely sounded more like doves cooing or emus booming. This shift in understanding is not just about correcting a popular misconception; it's about delving into the intricate world of dinosaur vocalization, where science and imagination collide.
The Sound of a Dinosaur: A Myth vs. Reality
For thirty years, the roar of a dinosaur has been a staple in documentaries, theme parks, and children's toys, shaping our collective imagination. However, paleontologists have been quietly working to unravel the mystery of dinosaur sounds, and their findings are nothing short of fascinating. The challenge lies in the fact that vocal cords, larynxes, and soft tissues decompose over time, leaving scientists with only bones and teeth to interpret.
In 2023, researchers made a groundbreaking discovery when they published the first description of a fossilized voice box from a non-avian dinosaur, followed by a second discovery in early 2025. These specimens suggest that dinosaurs produced sounds more akin to a dove's cooing or an emu's booming, rather than the mammalian roar we've come to associate with them. This anatomical evidence contradicts three decades of cinematic convention, raising questions about the accuracy of popular culture's portrayal of dinosaurs.
Unraveling the Mystery: Two Rare Fossils and Their Revelations
The 2023 discovery involved Pinacosaurus grangeri, a Late Cretaceous ankylosaur from modern-day Mongolia. An international team of researchers described the specimen in Communications Biology, noting that while its larynx shared structural features with modern crocodilians, it also exhibited specialized modifications previously documented only in birds. This study concluded that the dinosaur likely used its larynx as a vocal modifier capable of producing bird-like sounds, despite lacking the syrinx, a complex vocal organ unique to birds.
A second specimen emerged from northern China's Liaoning province in early 2025. Paleontologists described Pulaosaurus qinglong in the journal PeerJ, identifying it as only the second non-avian dinosaur preserved with a bony voice box. The fossil showed vocal structures similar to those of modern birds, further supporting the idea that dinosaurs had more complex vocal abilities than previously thought.
These two fossils, separated by thousands of kilometers and millions of years, represent the only direct evidence of non-avian dinosaur vocal anatomy ever recovered. The extreme rarity of such specimens explains why the field of paleoacoustics has advanced so slowly. Paleontologist James Napoli, who studied the Pinacosaurus specimen, emphasized the importance of these fossils in estimating the limits of dinosaur vocal behavior.
Evidence From Living Relatives: Birds and Crocodilians
A separate line of research published in the journal Evolution in 2016 examined vocalization data from more than 200 bird and crocodilian species—the closest living relatives of dinosaurs. Researchers found that closed-mouth vocalization evolved independently at least sixteen times within this group. This study demonstrated that this trait appears repeatedly across the archosaur family tree, suggesting deep evolutionary roots.
Modern birds, including doves, ostriches, and emus, use this method to generate low-frequency sounds that travel long distances without exposing the caller to predators. The anatomical requirements for closed-mouth vocalization align with the physical constraints of large bodies: bigger animals naturally produce lower frequencies, and keeping the mouth shut during sound production offers clear survival advantages for animals that cannot afford to advertise their location.
The study indicated that large sauropods, ceratopsians, and theropods likely used this mechanism to communicate across vast Mesozoic landscapes. Rather than open-mouthed roaring, these animals may have communicated through sounds more analogous to cooing, mumbling, or low-frequency booming.
Different Dinosaurs, Different Sounds
For some dinosaur groups, the evidence points to different sound-production mechanisms entirely. Duck-billed hadrosaurs, such as Parasaurolophus, possessed elaborate hollow head crests that functioned as resonant chambers. Paleontologists have used CT scans of fossil specimens to create computer models of these structures, simulating the sounds they could produce. The results generated calls described by researchers as otherworldly—deep, resonant tones closer to brass instruments than to animal vocalizations.
These findings complicate any single narrative about dinosaur sounds. Different groups likely produced different sounds using different anatomical structures. The hadrosaur crests represent one solution to the problem of sound production; the larynxes of Pinacosaurus and Pulaosaurus represent another. Whether these mechanisms overlapped or remained distinct across dinosaur lineages remains unresolved.
The Rarity of Preserved Vocal Anatomy and Its Impact
The rarity of preserved vocal anatomy limits what researchers can confidently claim. Cartilage and soft tissue fossilize only under exceptional conditions, which have occurred twice in more than a century of dinosaur paleontology. Scientists cannot determine whether complex vocal abilities were common across dinosaur groups or limited to specific lineages.
The Hollywood Problem: Jurassic Park's Impact on Public Perception
The gap between scientific evidence and public perception remains wide, largely because of Jurassic Park's enduring cultural footprint. The famous Tyrannosaurus rex roar was assembled from a baby elephant, a tiger, and an alligator—sounds chosen for dramatic effect rather than anatomical plausibility. Paleontologist Julia Clarke of the University of Texas has addressed this directly, stating that the films got it wrong and that a Tyrannosaurus rex would not open its mouth to roar, as predators do not advertise their presence before an attack.
Looking Ahead: The Future of Dinosaur Vocalization Research
Researchers continue prospecting for exceptionally preserved specimens in fossil sites known for soft-tissue preservation. Liaoning province in China and the Gobi Desert in Mongolia have yielded the two existing specimens, and geologists have identified additional formations with similar potential. Comparative studies of living archosaurs continue to refine hypotheses, and computer models of sound production based on fossil anatomy are becoming more sophisticated. As we continue to uncover the secrets of dinosaur vocalization, we may one day have a more accurate understanding of the sounds that shaped the prehistoric world.
