Iguanodon was a big dinosaur that lived a long time ago. It had a long neck, a big belly, and it walked on four legs. It was plant-eating, which means it liked to eat leaves and plants. Iguanodon had spikes on its thumbs that it might have used for protection. It lived in forests and liked to be around other dinosaurs. But now, there are no more Iguanodons because they lived a very long time ago!