Editing Corythosaurus (section)

===Crest function===
[[File:Corythosaurus snorkel.jpg|thumb|Outdated 1916 restoration showing ''C. casuarius'' as semi-aquatic]] 
The internal structures of the crest of ''Corythosaurus'' are quite complex, making possible a call that could be used as a warning or for attracting a mate. Nasal passageways of ''Corythosaurus'', as well as ''Hypacrosaurus'' and ''Lambeosaurus'', are S-shaped, with ''Parasaurolophus'' only possessing U-shaped tubes.<ref name="weishampel1981"/> Any vocalization would travel through these elaborate chambers and probably get amplified.<ref name="benson2012"/><ref name="ageofdinosaurscorythosaurus"/> Scientists speculate that ''Corythosaurus'' could make loud, low pitched cries "like a wind or brass instrument",<ref name="ageofdinosaurscorythosaurus"/> such as a trombone.<ref name="norrell2000p35"/> The sounds could serve to alert other ''Corythosaurus'' to the presence of food or a potential threat from a predator.<ref name="ageofdinosaurscorythosaurus" /> The nasal passages emit low-frequency sounds when ''Corythosaurus'' exhaled. The individual crests would produce different sounds, so it is likely that each species of lambeosaurine would have had a unique sound.<ref name="norrell2000p35"/> However, even though the range for different lambeosaurine nasal passages vary greatly, they all probably made low-pitched sounds. This might be because low sounds (below 400 [[Hertz|Hz]]) travel a set distance in any environment, while higher sounds (above 400&nbsp;Hz) have a larger [[Statistical dispersion|spread]] in the distance travelled.<ref name="weishampel1981"/>

When they were first described, crested hadrosaurs were thought to be aquatic,<ref name="norrell2000p35"/> an assessment based incorrectly on webbing that is now known to be padding.<ref name="benson2012"/><ref name="brown1916p712"/> The theory was that the animals could swim deep in the water and use the crest to store air to breath. However, it has now been proven that the crest did not have any holes in the end and the water pressure at even {{convert|3|m|ft}} would be too great for the lungs to be able to inflate.<ref name="norrell2000p35">p. 35 in Norrell, M. ''et al.'' (2000).</ref>