I am Lambeosaurus was a hadrosaur from the Late Cretaceous Period of North America. One species, Lambeosaurus laticaudus was one of the biggest ornithopods of all, at 13-15 metres long, with perhaps only the colossal Asian hadrosaur Shantungosaurus being larger. Lambeosaurus had two head crests, as opposed to the singular crests found on Parasaurolophus and Corythosaurus.