Monitor lizards (also known as iguanas) are normally large in size and can grow up to 3 metres long, but they can be as small as 20cm. In the Pleistone period( the Pleistone period was 2,588,000-11,700 years ago) these lizards could grow up to 7 metres and could weigh up to 600kg! They have a long neck, strong tails and strong claws. They've got a long and forked snake like tongue. Monitor lizards can also be found in Australia, Southern or Southeast Asia and on the islands in the Southwestern Pacific. The Montior lizards are carnivores and they have a diet of large insects and spiders, other lizards, small mammals and birds. Monitor lizards can adapt to the environment by camoflaging themselve from predators.