Parasaurolophus--Duck-Billed Dinosaur

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Parasaurolophus walkerii 

Parasaurolophus was a large hadrosaur or duck-billed dinosaur that lived in the late Cretaceous Period.  They were herbivores (ate plants) and had hundreds of blunt teeth for grinding plants.  Parasaurolophus had a prominent crest on its head.  Paleontologists sawed a fossilized crest in half and found that it was hollow.  Paleontologists think Parasaurolophus used the crest as a sound or resonance chamber to make deep and or loud sounds.  Some paleontologist's think that the sounds could have been so loud and powerful that a herd of Parasaurolophus could have blasted a predatory dinosaur (like Daspletosaurus) so hard that the sound would disable the predator.  So the crest may have been a defensive adaptation.  Males appear to have had larger crests than the females so males would have had deep bass voices and females would have had higher, perhaps tenor voices. 

The young would have had higher pitch  soprano or alto voices.  This means that a Parasaurolophus herd would have sounded like a choir warming up.  Parasaurolophus could walk on its two hind feet (biped) or on all four feet (quadruped).