Dinosaurs · Large ornithopod

Iguanodon

Say it ig-WHA-noh-don. The name means ‘iguana tooth’.

Iguanodon beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of large ornithopods

Length: 10 m
Weight: 4 tonnes
Diet: Plant-eaterplant material
Walked: On 2 or 4 legs
When: Early Cretaceous140 to 110 million years ago
Fossils found in: Belgium, England
Named by: Boulenger and van Beneden (1881)
Family tree: Dinosauria › Ornithischia › Ornithopoda › Euornithopoda › Iguanadontia › Euiguanadontia › Dryomorpha › Ankylopollexia › Iguanodontoidea

Where Iguanodon sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Large ornithopods. Big plant-eaters that walked on two or four legs, including the duck-billed dinosaurs. See all 36

Found in Britain. Fossils of Iguanodon have been found in the United Kingdom. Read about how Britain moved across the globe in Britain's journey.

Lived at the same time

Valdosaurus · same country
Becklespinax · same country
Eotyrannus · same country
Neovenator · same country
Hylaeosaurus · same country
Hypsilophodon · same country
Baryonyx · same country
Pelorosaurus · same country

Other large ornithopods

Equijubus Early Cretaceous
Jinzhousaurus Early Cretaceous
Camptosaurus Late Jurassic
Fukuisaurus Early Cretaceous
Lurdusaurus Early Cretaceous
Probactrosaurus Early Cretaceous
Tenontosaurus Early Cretaceous
Ouranosaurus Early Cretaceous

Source: Iguanodon in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.