Iguanodontia is a clade of herbivorous dinosaurs that lived from the Middle Jurassic to Late Cretaceous. Some members include Camptosaurus, Callovosaurus, Iguanodon, Tenontosaurus, and the hadrosaurids or `duck-billed dinosaurs`. Iguanodontians were one of the first groups of dinosaurs to be found. They are among the best known of the dinosaurs,.....