Duck-billed dinosaurs may have turned a string of trumpet-like instruments over 76 million years ago.
The giant reptiles had trumpet-like nasal passages, into which they blow air through a hollow head comb.
Different duck-billed dinosaurs may have produced different notes because, according to a new study, their heads were shaped differently.
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Pictured is the impression of an artist of a Parasaurolophus, one of the species studied in the new study. Different duck-billed dinosaurs may have produced different notes because, according to a new study, their heads were shaped differently
Researchers at the New York Institute of Technology College of Osteopathic Medicine carried out 3D scans of fossils of an unnamed species of Parasaurolophus.
The scans suggest that the duckbill was blown at 56 hertz.
The tone fell between the high tone of the previously studied Parasaurolophus cyrtocristatus (75 hertz) and the deep tone of P. Walkeri (48 hertz).
This suggests that several species of duck-billed dinosaurs had their own distinctive calls and recorded different notes on their horns.
Overall, the researchers studied five incomplete skulls of five unnamed Parasaurolophus dinosaurs.
They were found in the south of Utah 76 million years ago found in the rock.
Pictured is a digital image of the coat of arms of one of the newly found Parasaurolophus specimens. The species had trumpet-like nasal passages, into which they blow air through a hollow head comb
Most dinosaurs produced sounds with their vocal cords, which are soft tissue and therefore do not petrify well, leaving little evidence for the dinosaurs' sounds.
The skulls of species such as Parasaurolophus are gold dust for scientists because they have helped the animals to make noise and consist of bone, so have been preserved for millions of years.
Their nasal cavities and cavities do not give the scientists all the clues, but they provide information about how dinosaurs may have sounded.
Different duck-billed dinosaurs may have produced different notes because, according to a new study, their heads were shaped differently
"We never know exactly what those dinosaurs actually did," said the University of Texas scientist. Caroline Rinaldi, who was not involved in the study, told Live Science.
"However, the authors used an innovative combination of physics and physiological principles to develop a hypothesis that different types of Parasaurolophus (with different vertex shapes) produced sounds of different frequencies."
The research was presented at the 78th Annual Meeting of the Society of Vertebrate Paleontology in Albuquerque, New Mexico, on October 18th.