Parasaurolophus was a large quadruped herbivore from the Late Cretaceous period, 70 million years ago. It lived in the forests of North America. Parasaurolophus belonged to a family of dinosaurs named hadrosaurs, or “duck-bills”. All hadrosaurs had a crest on top of their heads, some were solid structures others were hollow. It is believed by researchers that the dinosaurs with the solid crests were capable of making a loud honking noise using their nasal sacs. But the most spectacular noise must of came from the hollow-crested hadrosaurs, which would force air through their crests creating a loud noise. One of the best examples is Parasaurolophus. Like many of the members of its family, Parasaurolophus had a broad and flat mouth, which made it look like a duck’s bill. One of its most noticeable features was the crest that elongated from the top of its head. In adult males, this crest could be as long as 6 feet long, big enough to fit an adult man inside. Parasaurolophus had a different tail; it was much bigger from top to bottom than from side to side. It may have been used to grab the attention from other members of its family. If it was bright in color, may have been used to attract possible mates, and also as a signal to other dinosaurs of its kind to be seen more easily in the dense forests; especially if Parasaurolophus tail was brightly colored.