A cassowaries casque is thought to serve the same function as many dinosaurs' horns did, and studies are being conducted into whether the cassowaries deep call is a result of the casque's role in sound production.
Read the full article here: http://www.sciencedaily.com/releases/2003/10/031028060039.htm
Wildlife Conservation Society. "World’s Largest Forest Birds May Produce World's Deepest Bird Calls; Cassowaries’ Low-frequency Sounds May Give Insight Into Dinosaur Communications." ScienceDaily 28 October 2003.
4 September 2008 http://www.sciencedaily.com /releases/2003/10/031028060039.htm.
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