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Parasaurolophus is a genus with three species (Cyrtocristatus, Walkeri, and Tubicens), each with a uniquely-sized crest reaching behind its head. These structures almost certainly were display features, but the network of hollow tubes found inside were also found to be perfect resonating chambers, creating a distinct noise for each individual. As well as providing a unique peek into an extinct animal’s lifestyle, it also allows us to make an educated guess as to what the Late Cretaceous forests sounded like.
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