Mason Blake
Scientists have been curious about what dinosaurs sounded like for decades, but it's only recently that technology has allowed them to start answering this question. In 2016, a team of palaeontologists led by Dr. Julia Clarke from the University of Texas at Austin discovered the oldest-known fossil of a bird's syrinx (voice box), which is responsible for all vocalizations in extant bird species. This discovery, along with advanced analysis techniques like CT scans and computer modelling, has allowed scientists to start piecing together how dinosaurs might have sounded. By studying the internal structures of dinosaur fossils, such as the crest of the Parasaurolophus, scientists can determine the natural frequency of the sound waves these dinosaurs were capable of producing, offering a glimpse into the soundscape of deep time.
| Characteristics | Values |
|---|---|
| Methods | Computer modelling techniques, X-ray tomography, CT scans, advanced analysis techniques |
| Tools | High-performance computers, Compaq Computer professional workstation, Intergraph Corporation TDZ workstation, Silicon Graphics infinite reality workstation |
| Findings | Dinosaurs probably made vocalizations, likely closed-mouth vocalizations, and low-frequency sounds |
| Evidence | Similar noisemaking structures to modern reptiles and birds, large stapes, long cochlear ducts |
| Limitations | Lack of direct evidence, absence of voice boxes in most dinosaur fossils |
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What You'll Learn
Fossil analysis
One of the most famous examples of this is the Parasaurolophus dinosaur. A well-preserved skull, including a nearly complete crest, was discovered near Farmington in northwest New Mexico. The crest was analysed using digital palaeontology, which allowed for a thorough analysis of its internal structure without causing any damage to the fossil. The analysis revealed a complicated network of tubes and chambers, which scientists theorised were used to produce and amplify sound.
In another example, Chinese palaeontologists discovered the fossilised wings of an ancient bush cricket in Inner Mongolia and were able to regenerate its chirp. The cricket would have lived alongside dinosaurs, so its song may have been a common sound in the dinosaur soundscape.
Palaeontologists have also analysed the large bones in dinosaur ears, which suggest that dinosaurs were able to hear lower frequencies than humans. This indicates that dinosaurs may have produced low-frequency vocalisations.
Additionally, the discovery of a fossilised dinosaur larynx bone in Mongolia has provided further insight into dinosaur vocalisations. The laryngeal bone was similar to those of modern-day birds, suggesting that dinosaurs were capable of producing sounds more complex than the monotone noises made by modern reptiles.
Through these fossil analyses and reconstructions, scientists have been able to gain a richer understanding of the soundscape of the primordial world.
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Computer modelling
In the case of the Parasaurolophus, a rare skull fossil discovered in 1995 in New Mexico, computer modelling played a crucial role in deciphering its possible sounds. The fossil included a well-preserved crest, which scientists believed was used for producing distinctive sounds. By performing CT scans of the crest, scientists were able to gain unprecedented insights into its internal structure, revealing a labyrinth of air cavities and tubes.
Using high-performance computers and unique software, scientists determined the size and shape of the air passages within the crest. This information was key to calculating the natural frequency of the sound waves produced by the dinosaur, much like how the pitch and tone of a musical instrument are determined by its physical characteristics. The complexity of the crest's shape required a vast amount of data to be described accurately in the computer model.
Once the 3D model was completed, the computer simulated the movement of air through the crest's air passages, amplifying the tones it could produce. This simulation provided an approximation of the sounds the Parasaurolophus might have made, including variations with and without vocal cords, as their presence in this dinosaur is uncertain. The resulting sound has been described as "otherworldly" and "somewhat birdlike".
The application of computer modelling in this context has opened up new possibilities for scientific research and engineering. It has also sparked interest from filmmakers seeking to incorporate more realistic dinosaur sounds in their productions.
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Comparison to modern animals
Scientists have been able to gain some insight into the sounds dinosaurs made by comparing their anatomy to that of modern animals. Many dinosaurs likely made vocalizations because they possessed some of the same anatomical structures that modern vertebrates use today to vocalize. For example, many dinosaurs are thought to have had larynx-like structures or some other transitional organ that allowed them to vocalize.
Additionally, some dinosaurs may have possessed a syrinx, a structure that allows songbirds to produce melodious notes. However, evidence of a syrinx in dinosaurs only goes back 66-68 million years ago, which is close to when dinosaurs died out, so scientists are unsure if dinosaurs had this structure.
Another clue comes from the size of the cochlear ducts in the inner ears of dinosaur fossils, which suggest that dinosaurs could have been able to pick up high frequencies. The stapes in dinosaur ears were also often quite large, indicating that they were well-tuned to lower frequencies.
Computer modelling techniques have also been used to create dinosaur sounds by simulating the airflow through their vocal organs. This has led to the hypothesis that dinosaurs may have made closed-mouth vocalizations, similar to modern examples such as crocodilian growls and ostrich booms, rather than the open-mouthed roars often depicted in popular culture.
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Vocal anatomy
Scientists have discovered that dinosaurs likely made vocalizations because they possessed some of the same anatomical structures that modern vertebrates use to vocalize. These vocalizations were probably not open-mouthed roars like those depicted in the Jurassic Park films, but rather closed-mouthed sounds like the growls of crocodilians or ostrich booms.
The study of sound associated with fossils is called paleoacoustics, and it has helped scientists understand what dinosaurs might have sounded like. One important discovery was the fossil of a bird's voice box, or syrinx, in the remains of an extinct Antarctic bird named Vegavis iaai that lived alongside dinosaurs. This discovery suggested that some dinosaurs may have had a syrinx as well, which could have been used for vocalizations. However, evidence of a syrinx in dinosaurs only goes back to between 66 and 68 million years ago, which is close to the time when dinosaurs became extinct.
Another approach to understanding dinosaur vocalizations is through the study of their vocal anatomy. For example, paleontologists have studied the crest of the Parasaurolophus, a dinosaur with a distinctive headcrest. By using computerized tomography (CT) scans and computer modeling techniques, they were able to digitally reconstruct the crest and simulate the sounds it could have produced. These sounds have been described as otherworldly and possibly bird-like, including songs to call to one another.
The size and structure of the cochlear ducts in the inner ears of dinosaur fossils also provide insights into their hearing abilities and the types of sounds they could produce. Smaller stapes, for example, would correlate with high-frequency sounds, while larger stapes, like those found in T. rex, indicate an ability to hear lower frequencies. Additionally, some dinosaurs may have had inflatable cavities that allowed them to make murmuring sounds, similar to those produced by reptiles or birds with esophageal pouches.
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Pitch and frequency
Scientists have been able to gain some insight into the pitch and frequency of dinosaur sounds through the study of fossilised anatomy and the application of advanced computer modelling techniques.
In the case of the Parasaurolophus, a well-preserved skull, including a nearly complete crest, was discovered near Farmington in New Mexico. Palaeontologists used computed tomography (CT) scanning to capture detailed images of the crest's internal structure. The scans revealed a complex network of tubes and chambers within the crest, which were believed to be involved in sound production.
Computer scientists then digitally reconstructed the crest and simulated how it would behave when air was passed through it. By analysing the size and shape of the air passages, they could determine the natural frequency of the sound waves produced, which governs the pitch and tone of the resulting sound. This process required powerful computers and unique software capable of processing and interpreting complex data.
The reconstructed sounds produced by the Parasaurolophus have been described as ""otherworldly" and "somewhat birdlike". While the presence or absence of vocal cords in dinosaurs is uncertain, these simulations provide valuable insights into the range of sounds they may have been capable of producing.
Additionally, the size of the stapes and cochlear ducts in the inner ears of dinosaur fossils offers clues about their hearing abilities and the frequencies they could detect. Smaller stapes are correlated with higher-frequency sounds, while longer cochleae are generally associated with a greater range of audible sounds.
It is important to note that the reconstruction of dinosaur sounds is a complex and speculative process. Scientists must use their creativity and knowledge of anatomy and acoustics to fill in the gaps left by the incomplete fossil record.
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Frequently asked questions
Scientists have discovered dinosaur sounds through the use of advanced fossil analysis techniques and computer modelling. They study the anatomy of dinosaurs, including their hearing abilities and vocal organs, to make educated guesses about the sounds they produced.
One technique involves using computerized tomography (CT) scanners to create detailed images of dinosaur fossils, such as the crest of the Parasaurolophus. These images are then used to digitally reconstruct the dinosaur's organs and simulate how they would produce sound. High-performance computers are used for image processing, analysis, and sound creation.
One challenge is that sound does not fossilize, so scientists must rely on indirect evidence, such as studying the anatomy of related species and making comparisons with modern animals. Additionally, the absence of certain vocal structures in dinosaur fossils, such as the syrinx, suggests that some dinosaurs may not have had the ability to produce complex sounds.
