Dinosaur Iguanodon is a genus of ornithopod dinosaur that lived from about 139-138 million years ago, from the early to late Cretaceous period. Iguanodon was the second dinosaur ever discovered and it was one of the first dinosaurs to be named, preceded only by Megalosaurus. Iguanodon's name means "iguana tooth" due to its iguana-like teeth. It was the largest of its kind. It lived in Antartica, North Africa, Mongolia and Europe, mainly in England in the UK and Belgium. All these Dinosaur Iguanodon pictures were collected from the internet. Enjoy!