The primitive ornithopod dinosaur Iguanodon lived during the Early Cretaceous period in Europe, approximately 125 million years ago. Animals like Iguanodon eventually gave rise to the hadrosaurs of the Late Cretaceous. In the past, numerous remains from all over the globe have been attributed to this genus, spanning from the Late Jurassic all the way until the end of the Cretaceous period, but current research suggests that the only valid species of Iguanodon (I.