A few species are burrowers and dig rapidly into the sand when danger approaches. They are strong swimmers and divers.
Iguanas are herbivores, the young eat meat.
The common iguana is often found in tree tops up to 20 metres above the ground. If disturbed it will drop to the ground from heights of up to 6 m. Have a highly developed social system. Egg clutches varies from 1-45 depending on species. In 1979 the Fijian Crested Iguana was discovered. There are only one or two hundred in the world and no one knew they existed before this.