Living: Skeletons found both in Canada and Mexico, indicate, that this dinosaur walked very far next to the western shore in USA. When it ate through the landscape with its small beak, it could easily have taken leaves of special flowers and plants. Handrosaurids with wider beaks have probably been less squeamish. A nose-horned dinosaur with parrot-like beaks has possibly eaten all the plants, which no other duck-beaked dinosaur could eat.

By Shiraishi Mineo

These different eating habits with many of the duck-beaked dinosaurs and other Ornithischies, prevented a total extinction of the vegetation. The same distribution of the food-resources exists today among herbivorous animals on the African savannas. Three different Lambeosaurus-species with each special crest are known today. The Hadrosaurs, which were the Lambeosaurus and the Corythosaurus with hollow crest, and the Hadrosaurids like the Edmontosaurus.

Signals: Members of a Lambeosaurus-herd could recognize each other visually on the variations of the crests. But if an animal had lost its group, it could easily come in contact with them by voice. The tubes inside the crest worked as a sound box, enhancing the sound that the dinosaur did made. It is possible that different Lambeosaurids all could be recognized on the voice: Lambeosaurus’ must have made another sound than the Corythosaurus’ helmet-shaped crest made. Prosaurolophus had no crests, but was instead equipped with "nose-balloons". It might have sounded like today’s sea elephants.

Head shapes: The Lambeosaurus Magnicristatus had a forwarded crest. The Parasaurolophus, another Lambeosaurid, had a longer bony crest. Kritosaurus, a hadrosaurid duck-beaked dinosaur, had only a hump in front of the eyes, which were probably covered with thick skin.