Duckbilled dinosaurs of about 90 million years ago had huge crests with complex nasal passages, and used them to honk sexual and social messages, according to a new study in the journal Paleobiology.
"The crest likely evolved to play a role in behavior of both vocal and visual display -- to call to attract a mate or warn of predators or something like that," said David Evans, a researcher at the University of Toronto.
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