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About Anatotitan:
It took paleontologists a long time to figure out exactly what type of dinosaur Anatotitan was. Since the discovery of its first 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 squat, herbivorous dinosaurs known as hadrosaurs, an idea that has since been accepted by most of the dinosaur community. (A newer study, however, insists that Anatotitan was really a superannuated specimen of Edmontosaurus.)
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.
