such a crowded eco-space. The only large predators known from the same levels of the formation as Corythosaurus are the tyrannosaurids Gorgosaurus libratus and an unnamed species of Daspletosaurus. Thomas M. Lehman has observed that Corythosaurus hasn't been discovered outside of southern Alberta even though it is one of the most abundant Judithian dinosaurs in the region. Large herbivores like the hadrosaurs living in North America during the Late Cretaceous had "remarkably small geographic ranges" despite their large body size and high mobility. This restricted distribution strongly contrasts with modern mammalian faunas whose large herbivores' ranges "typical[ly] ... span much of a continent." See also Timeline of hadrosaur research Footnotes References External links Late Cretaceous dinosaurs of North America Lambeosaurines Fossil taxa described in 1914 Taxa named by Barnum Brown Oldman fauna Dinosaur Park fauna Paleontology in Alberta Campanian genus first appearances Campanian genus extinctions Ornithischian genera