Photo: Crested Duck-Billed Dinosaurs Used "Caller ID"?

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Like other lambeosaurs, the helmet-crested Corythosaurus—seen above at top in an artist's rendering—had long, looping nasal passages inside its bony crest.

Medical CT scans (above, bottom) released at an October 2008 paleontology meeting support the theory that the nasal passages were used for communication.

Dinosaur illustration courtesy Michael Skrepnick; skull CT scans courtesy Witmer & Ridgely, Ohio University

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