Crest concept goes "extinct"

Duck-billed dino crests not linked to sense of smell
University of Toronto study dispels decades-old theory

After decades of debate, a U of T researcher has finally determined that duck-billed dinosaurs' massive but hollow crests had nothing to do with what many scientists suspected -- the sense of smell.

Speculation about their function has led to theories that the crests functioned as everything from brain coolers to snorkels for underwater feeding. Now, David Evans, a PhD student in zoology at the University of Toronto at Mississauga, has been able to use a reconstructed brain cavity to rule out one historically popular theory: that the crests evolved to increase the animal's sense of smell.

"From the brain case, there's no indication that the nerves curled upwards into the crest, as we would expect if the crest was used for the sense of smell," Evans says.

"It appears that the brain changed very little from their non-crested dinosaur ancestors, and that the primary region of the sense of smell was located right in front of the eyes – and coincidentally, that's where it is in birds, crocodiles, mammals and basically all four-legged animals."

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Contact:
Nicolle Wahl
nicolle.wahl@utoronto.ca
416-978-6974
University of Toronto