A “near-crested lizard” Reconstruction of the environment where Parasaurolophus walkeri lived during the Cretaceous. Credit: Marco Antonio Pineda/CC BY-SA 4.0
The most intriguing hypothesis is that the crest served as a resonating chamber, first proposed in 1931 by Swedish paleontologist Carl Wiman, who noted that the crest’s structure was similar to that of a swan and thus could have been used for vocalization. Lin stumbled upon a 1981 paper by David Weishampel expanding on the notion, predicting that the dinosaur’s calls would have fallen in the frequency range of 55 to 720 Hertz. Weishampel’s model
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