Parasaurolophus is a hadrosaur, or "duck-bill", dinosaur from the Late Cretaceous Period. It has appeared in several Disney productions. This particular Parasaurolophus is showcased in the Walt Disney feature film Dinosaur.
A few Parasaurolophus appear in the The Rite of Spring segment of Fantasia. Two are seen eating plants. These two are both seen again a few moments later when the Tyrannosaurus Rex appears. As it chases the dinosaurs, a few other Parasaurolophus can be seen running away. A few Parasaurolophus can be seen watching the Tyrannosaurus Rex and Stegosaurus while they're fighting with a group of herbivorous dinosaurs. Near the end of the segment, they are among with the many dinosaurs ended up on dying of starvation and dehydration.
A young Parasaurolophus is first seen at the very beginning of the movie peeking into the nests of Iguanodons. Then as it prances around, it sees a flying reptile. The young dino follows the odd creature into a thick jungle. It looks up to where the reptile was. Then saliva falls and hits a branch which causes the Parasaurolophus to look up. It then comes running out of the jungle which catches the attention of most of the dinosaurs. As it runs, a Carnotaurus bursts out of the trees and starts to chase all of the dinosaurs.
Later, many Parasaurolophus (adults and young ones) are seen migrating in Kron's herd to the nesting grounds. No Parasaurolophus speak in this movie.
Parasaurolophus is one of the rarer hadrosaurs from the late cretaceous.
Parasaurolophus' crest was likely used as a resonating chamber for helping the animal create sound. Indeed, palaeontologists made a 3D-model of the crest using a real Parasaurolophus skull as reference and blew air through it. The resulting sounds were not unlike those of musical instruments like trombones.
Parasaurolophus' crest developed as the animal grew, as evidenced by a fossil of a very young individual found in New Mexico. As a result, adults had deeper voices than the infants.