Height: 13 feet
Weight: 3 tons
- Adults (both sex): Forest green with a lighter green belly and pink on the throat (more vibrant in males).
- Juveniles (both sexes): A more vibrant version of the adult, but without the pink on the throat.
Diet: A wide variety of vegetation which it chews with its grinding cheek teeth.
Preferred Habitat: Forests or plains dotted with significant strands of trees.
Social Structure: Large herds with a single alpha male in charge of a few other males, many females and young. Females within the herd are subordinate to the males.
Iguanodon is a large, heavy bodied herbivore, somewhat resembling a crestless species of hadrosaur. It has a long head with toothless beak, its back teeth hidden by fleshy cheeks, and its forelegs are shorter than its hindlegs. Males tend to be larger than females.
Iguanodon’s hand is a specialized tool and is probably its most famous feature. The three middle fingers are stout and joined together, forming hooves used for walking. The fifth finger is opposable and can curl around objects to grasp; and the thumb is modified into a huge spike - the Iguanodon’s main weapon or sword
This spike tends to be larger in males.
Iguanodon is generally peaceful and can often be seen alongside the much smaller Dryosaurus when feeding. However Iguanodon is aggressive and dangerous when faced with predators. Most predators will usually only target the more vulnerable individuals such as the young or the sick, as the healthy adults are powerful and will defend themselves with their bulk and deadly thumb spikes.
During the breeding season males show off their thumb spikes in wide stabbing motions, with both males remaining at a distance from one another to avoid serious injury. However, if the contests become more intense, the males will move on to tackling one another - trying to force their opponents to the ground. The winner will establish or retain his dominance over the herd and thus win mating rights.
When it is time for egg-laying, multiple Iguanodon herds will congregate into a single, massive herd to migrate to their nesting grounds, which they use year after year. Females build nests that are close together with enough room for the adults to move in between, and all help one another protect the eggs and hatchlings from predators.
Iguanodon calls include deep roaring and bellowing, as well as snorts and grunts. Male Iguanodon make a lot more noise than the females and young, particularly during disputes with other males; warning off predators; displaying to females; and keeping herd members in line. It is generally the dominant male which produces the loudest calls and makes the most noise. It can be heard 6 miles away