Lambeosaurus (pronounce /ˌlæmbioʊˈsɔrəs/, meaning "Lambe's lizard") is a genus of hadrosaurid dinosaur that lived about 76 to 75 million years ago, in the Late Cretaceous Period (Campanian) of North America. This bipedal/quadrupedal, herbivorous dinosaur is known for its distinctive hollow cranial crest, which in the best-known species resembled a hatchet. Several possible species have been named, from Alberta (Canada), Montana (USA), and Baja California (Mexico), but only the two Canadian species are currently well known. At about 15 meters (50 ft) long, the Mexican species L. laticaudus was one of the longest ornithischians. The other species were more modestly sized.