A species now considered distinct from Edmontosaurus annectens. The new generic name was suggested by Donald Baird. Cope's original type specimen (AMNH #5886) is the source of the popular term "duckbilled dinosaur," a term Cope himself did not use, however. In one of the great dinosaur finds of all time, two of Cope's collectors, J. L. Wortman and R. S. Hill, unearthed a well preserved, almost complete hadrosaur skeleton in the Black Hills of South Dakota in the summer of 1882. The skull and lower jaws were virtually intact, providing the first good evidence for a startling looking creature, quite distinct from the European Iguanodon, the former model for hadrosaurs.