Dinosaurs were not silent creatures. They used vocalizations much like today’s modern animals do. Watch out for these roars though. They are probably a final warning. The T-Rex and Raptors are expected but even the herbivores like Parasaurolophus had a mighty sound.
Watch the whole playlist of dinosaur videos here: http://www.youtube.com/watch?v=sW4p6vzviKQ&list=PLfpPYJH6OjtZGZH1hlR40wD4rnq14p41x&index=1
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