Parasaurolophus was a large herbivore that lived in the late cretaceous period. Parasaurolophus is a hadrosaur. Hadrosaurs are a species of dinosaur with a duck bills. Parasaurolophus was one of a group of hadrosaurs called lambeosaurines. Though hadrosaurs are popular dinosaurs, Parasaurolophus is poorly known. Lambeosaurine have oddly shaped crests on their heads. Parasaurolophus had a crest that looked liked a pole with a curve on the end. These crest could have been used to make loud calls to herd its mates. Also they could have been used as identification. Parasaurolophus is known as the trumpet dinosaur. Parasaurolophus was first discovered in Alberta Canada. Later on, more Parasaurolophus fossils were found in New Mexico. Scientists noticed as more Parasaurolophus fossils were found, that the different fossils from different places crests were slightly different. The crest of Parasaurolophus could be from 3-5 ft. long. Paleontologists think that usually the females had shorter crests than the males. Parasaurolophus can have 43 rows of teeth! In the 1920's part of a Parasaurolophus skull was sold to the Field Museum, where Sue is now.