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Anatotitan was a biped (it walked on two legs) but it could also walk on four legs, perhaps to graze low-lying plants. Anatotitan was probably a relatively slow-moving dinosaur with few defenses, but may have had keen senses (eyesight, hearing, and smell) to help it avoid predators.
WHEN ANATOTITAN LIVED
Anatotitan lived in the late Cretaceous period, about 70-65 million years ago, toward the end of the Mesozoic Era. It went extinct during the huge K-T mass extinction. T. rex and Dromaeosaurus were among its contemporaries, and they may have preyed upon Anatotitan.
Anatotitan was an ornithopod, whose intelligence (as measured by its relative brain to body weight, or EQ) was midway among the dinosaurs.
Anatotitan was an herbivore, a plant eater. It probably ate conifer needles, twigs, seeds, and other plant material with its tough beak. It had no teeth in its beak, but had hundreds of cheek teeth used for grinding up the tough plant material that it ate. Anatotitan had three rows of replacable teeth for a total of 720 teeth - it a tooth broke off, another replaced it.
Anatotitan could run on two legs or walk on four. It may have gone on all four legs to graze low-lying plants. It was not a very speedy dinosaur.
DISCOVERY OF FOSSILS
Anatotitan fossils have been found in Montana and South Dakota, USA. It was named by Ralph Chapman and Michael K. Brett-Surman in 1990. Anatotitan was originally called Anatosaurus (Lull & Wright, 1942).
Anatotitan was a late Ornithischian dinosaur, the order of bird-hipped, herbivorous dinosaurs. It was a member of the suborder Ornithopoda, and the family of duck-billed, herding herbivores, the hadrosaurs. Other hadrosaurs include Maiasaura, Lambeosaurus, Parasaurolophus, Corythosaurus, and Saurolophus.
(and Other Prehistoric Creatures)
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