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About Corythosaurus:
As you can guess from its name, the most distinctive feature of the hadrosaur Corythosaurus was the prominent crest on its head, which looked a bit like the helmet worn by the ancient Greeks of Corinth. However, unlike bone-headed dinosaurs such as Pachycephalosaurus, this crest wasn't used to establish dominance by head-butting other dinosaurs, but for display and communication purposes.
In a spectacular bit of applied paleontology, researchers have created models of Corythosaurus' hollow head crests, and found that they create a booming sound when funneled with air. It's clear that this large, gentle herbivore used its crest to signal to others of its species--though we may never know whether these sounds broadcast sexual availability or warned about the presence of carnivores.
