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View full size image. One of the best-known sauropods (long-necked herbivorous dinosaurs), this genus of dinosaur lived during the late Jurassic Period, about 155.7 million to 150.8 million years ago, and primarily roamed western North America.
Hadrosaurids (Greek: á¼Î´ÏÏÏ, hadrÃ³s, stout, thick), or duck-billed dinosaurs, are members of the ornithischian family Hadrosauridae. This group is also known as the duck-billed dinosaurs, for the flat, duck-bill appearance of their mouths. The family, which includes ornithopods such as Edmontosaurus and Parasaurolophus, was a common herbivore in the Upper Cretaceous Period of what is now Asia, Europe, Antarctica, South America and North America.