Iguanodonts

These dinosaurs were bipedal herbivores with long toes that ended in hooflike claws. Their arms were thick and strong, and they may have often walked on all fours, perhaps when foraging for food. Iguanodonts had a single row of tall, ridged teeth, with which they chewed their food before swallowing it. The best-known iguanodonts are Iguanodon and Ouranosaurus.

, Ridges on edge of

Worn-down tooth

, Ridges on edge of

Worn-down tooth

Iguanodon stabbing a theropod in the neck
Iguanodon Thumb

Wear and tear The Iguanodon teeth above are at different stages of wear. The one on the right has been worn down by Iguanodon's diet of tough plants, while the one on the left looks like it has hardly been used.

Stabbing weapon Iguanodon had large, bony thumb spikes. These may have been used as weapons against enemies, such as theropods. Iguanodon may have used its thumb spike to stab an attacker through the throat, belly, or eyes.

Iguanodon The head of Iguanodon had a toothless beak for nipping vegetation. Its arms were much shorter than its hind legs, which ended in strong, three-toed feet to support its heavy weight. Its thick tail was very stiff, and was held out almost horizontally.

Iguanodont facts

• The name iguanodont means "iguana tooth."

• They ranged in length from 13 ft (4 m) to 291A ft (9 m).

• They lived from late Jurassic through to late Cretaceous periods.

• An Iguanodon shin bone found in 1809 was not identified as belonging to Iguanodon until the late 1970s.

Bump on forehead

Bump on forehead

Ridged I

Ouranosaurus skull teeth Ouranosaurus had a long, ducklike bill, and ridged teeth like those of Iguanodon. Its skull was flat-topped with a small bump on its forehead. A special jaw hinge allowed Ouranosaurus to chew by sliding the upper jaw outward against the lower jaw.

Duck like bill

Iguanodon was about 29'/2 ft (9 m) long.

Duck like bill

Iguanodon was about 29'/2 ft (9 m) long.

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