Palaeontologists have long debated the function of the strange, bony crests on the heads of the duck-billed dinosaurs known as lambeosaurs. The structures contain incredibly long, convoluted nasal passages that loop up over the tops of their skulls.
Scientists at the University of Toronto, Ohio University and Montana State University now have used CT-scanning to look inside these mysterious crests and reconstruct the brains and nasal cavities of four different lambeosaur species.
At the annual meeting of the Society for Vertebrate Palaeontology in Cleveland, Ohio, the team announced new findings that suggest the crests were used for communication.
The research was funded by the National Science Foundation (NSF), and the National Science and Engineering Research Council of Canada.
“These scientists have used cutting-edge visualisation and reconstruction techniques to show that duck-billed dinosaurs likely communicated via sound and signal,” said Adam Summers, program director in NSF’s Division of Integrative and Organismal Systems.
“Trace fossils were once our main window into the behaviour of long-vanished organisms,” said Summers. “Now, it’s clear that the reconstruction of hard tissues and associated soft tissue is a powerful tool for understanding behaviour and physiology.”
Some palaeontologists have suggested that the crests heightened the sense of smell by increasing the surface area of the sensory tissue. Others have argued that they regulated temperature, and still others have speculated that the crests acted as sound resonators for communication.
“The shape of the brain can tell us a lot about what senses were important in a dinosaur’s everyday life, and give insight into the function of the crests,” said scientist David Evans, a palaeontologist at the Royal Ontario Museum and the University of Toronto.
“It’s difficult to infer the function of structures in an extinct dinosaur when there is so little resemblance to any living animal,” said Jack Horner, a member of the team and palaeontologist at Montana State University.
By using and analysing CT scans, conducted by Lawrence Witmer and Ryan Ridgely of Ohio University’s College of Osteopathic Medicine, the scientists were able to circumvent the problems of fossilisation.
“Even though the soft tissues are not preserved in the fossils, the shape of the bones that encase the brain and nasal passages are,” said Evans. “From there, the anatomy of these missing soft parts is easily interpreted.”
The CT scan results revealed a mismatch between the external shape of the crest and the internal shape of the nasal passages in closely related species, suggesting a special function for the nasal cavity.
The portion of the brain responsible for the sense of smell was relatively small and primitive, indicating that the crest did not evolve to improve that sense.
Computer models done by other researchers suggest that the crests could have been used to make low, eerie bellowing calls that could have been used in communication, perhaps to call for mates or warn others of predators.
The CT scans documented a delicate inner ear that confirms that the dinosaurs could hear the low-frequency calls produced by the crest.
“We were surprised to see just how large the centres of the brain associated with higher cognitive functions were,” said Witmer. “We suspected that the crested duck-billed dinosaurs used both vocal and visual displays, but now we see that they had the brain power and hearing to pull off these behaviours.”