Iguanodon

Iguanodon Information

Iguanodon was a large, gentle plant‑eating dinosaur that lived around 125 million years ago. It had a beak-like mouth for nibbling leaves and a stiff tail to help it balance. One of its coolest features was its pointy thumb spike, which may have been used for protection. Iguanodon could walk on two legs or four, making it a very flexible mover for such a big dinosaur! 

Some of the most important Iguanodon fossils were actually found right here in the UK. The very first ones were discovered in the early 1800s in Sussex, and more have since been uncovered on the Isle of Wight—one of the best places in Europe to find dinosaur bones. These discoveries helped scientists learn what Iguanodon looked like, how it lived and even made the UK one of the first places in the world where dinosaurs were studied. 

Iguanodon Facts

  • Pronounced: ig-GWAN-uh-don
  • Meaning: The word Iguanodon means ‘iguana tooth’ 
  • Size: The average Iguanodon was typically 9–11 meters (30–36 feet) long and weighed around 4.5–5 tons
  • When did it live? Iguanodon lived during the Early Cretaceous period, around 130–110 million years ago
  • First Discovered: Iguanodon was one of the first dinosaurs described by scientists, discovered in England in 1822 by Gideon Mantell
  • Diet: Iguanodon was a herbivore — a plant‑eater

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