Science, Tech, Math › Animals & Nature Anatotitan Facts and Figures Share Flipboard Email Print Nobu Tamura/Wikimedia Commons/CC BY 3.0 Animals & Nature Dinosaurs Herbivores Basics Paleontologists Carnivores Dinosaurs & Birds Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated November 04, 2019 Name: Anatotitan (Greek for "giant duck"); pronounced ah-NAH-toe-TIE-tanHabitat: Woodlands of North AmericaHistorical Period: Late Cretaceous (65 to 70 million years ago)Size and Weight: About 40 feet long and 5 tonsDiet: PlantsDistinguishing Characteristics: Large size; broad, flat bill About Anatotitan It took paleontologists a long time to figure out exactly what type of dinosaur Anatotitan was. Since the discovery of its fossil remains in the late 19th century, this giant plant-eater has been classified in various ways, sometimes going by the now-unfashionable names Trachodon or Anatosaurus, or considered a species of Edmontosaurus. However, in 1990, a convincing case was presented that Anatotitan deserved its own genus in the family of large, herbivorous dinosaurs known as hadrosaurs, an idea that has since been accepted by most of the dinosaur community. A newer study, however, insists that the type specimen of Anatotitan was really a superannuated specimen of Edmontosaurus, hence its inclusion in the already-named species Edmontosaurus annectens. As you might have guessed, Anatotitan ("giant duck") was named after its broad, flat, duck-like bill. However, one shouldn't take this analogy too far: the beak of a duck is a very sensitive organ (a bit like human lips), but Anatotitan's bill was a hard, flat mass used mainly to dig up vegetation. Another odd feature of Anatotitan (which it shared with other hadrosaurs) is that this dinosaur was capable of running clumsily on two legs when it was chased by predators; otherwise, it spent most of its time on all four feet, munching peacefully on vegetation.