Hypacrosaurus ("very-high-lizard") is a hadrosaur similar in look to Corythosaurus. Like Corythosaurus, it has a domed crest, although at the time it was named its skull was unknown. This crest differs from that of Corythosaurus in that it is narrower, lower, and less curved in shape. A large hadosaur, it proceedings approx. 9 meters in length. It is recognized from the Early Maastrichtian (late Cretaceous) of Canada and Montana.