Classification: Reptiles, ornithischia, ornithopoda

Body length: 10 m

Body weight: 3 t

Epoch: Early Cretaceous

Locations: England, Belgium, Germany, North Africa, USA

Iguanodon was a dinosaur with a horny, toothless beak and tightly arranged maxillary teeth. Each of its arm had four fingers and a single spike in place of a thumb, which was perpendicular to other fingers.

These spikes could have been used for defence or food extraction. Iguanodon had a flat, robust tail and three-fingered back legs with hoof-like nails.

It was a herbivore, eating prehistorical plants with its strong, toothless beak.