Pachycephalosaurus: An Early Representative of the Hadrosauriformes

Gryposaurus, a duck-billed dinosaur from Late Cretaceous North America, reached lengths of up to 8 meters. Its name means "hooked-nose lizard," referring to the prominent arched bump on its snout that creates a hooked appearance. This nasal structure likely played a role in species recognition and sexual selection. Gryposaurus was a relatively basal member of the hadrosaurids, lacking complex cranial crests. It possessed dental batteries capable of efficiently grinding tough plant material. Fossils have been found in Utah and Alberta, indicating widespread distribution across western North America during the Late Cretaceous. Typically living in herds, Gryposaurus was one of the most common herbivorous dinosaurs in its ecosystem.