This was a robust animal prehistoric herbivore that could switch between bipedal to quadrupedal. The well-known species, I. bernissartensis, it is estimated that weighed about 3 tons on average, and measure about 10 feet long when adult, with some specimens possibly would have reached 13 meters.
The arms were long, up to 75% of the length of the legs with inflexible hands built so that the three central fingers could bear weight.
One of the first details on the iguanodons noticed was that I had reptile herbivore teeth (Iguanodon means "Iguana tooth" as they were of a similar but larger and with a greater destructive capacity) although there was not always consensus on how to eat .
There is no evidence to support a sexual dimorphism, as in hadrosaurs and Ceratopsia.
It is thought that they lived in herds of several dozen individuals as fossils have been found in certain circumstances, several bodies Iguanadon in ancient lakes or rivers, possibly due to the flood of these during migration.
They lived in the early Cretaceous period, makes about 130 to 120 million years (mong the Berriasian and Aptian) in what is now Europe. And in North America.
The scion of thumb is one of the best known features of the iguanodons. Yet it was placed, initially, in the nose by Mantell. When they found the complete copies in Bernissart Dollo realized the mistake and I put in place fingerprint, thumb amended.