Join Discovery Dinosaurs for incredible kid-friendly videos. 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. Head over to http://testtube.com/ for more amazing science videos! Watch the whole playlist of dinosaur videos here: http://www.youtube.com/watch?v=sW4p6vzviKQ&list=PLfpPYJH6OjtZGZH1hlR40wD4rnq14p41x&index=1 Subscribe For More Dinosaur Videos: http://www.youtube.com/subscription_center?add_user=discoverydinosaurs