Iguanodon was the first plant-eating dinosaur ever discovered, and the second dinosaur to be named. A sharp spike on its thumb provided a useful defensive weapon against predators. It occupied Europe during the Early Cretaceous, 125 million years ago.Scientific Name: Iguanodon bernissartensisCharacteristics: Iguanodon is a herbivorous dinosaur, 33 feet long - the size of a small bus. It could walk on two long back legs, but spent most of its time on all fours. It has a horny beak and leaf-shaped teeth, similar to those of a modern iguana. It ha