Geckos are found worldwide in all the warmer regions. What distinguishes them as a family is that they have the ability to produce sounds. Some make high pitched calls, some sound like ducks, and others like barking dogs. The rest have round pupils. They all have flattened bodies, short necks and wide flat heads.
Geckos are generally hardy and fairly easy to maintain in captivity.
Many will also breed easily in captivity. The Iguana is the largest of the lizard families and consist of 60 genera and over 700 species. The Iguanids contain the curlytails , swifts , anoles , and iguanas as well as others. Specifically they are found from southern Canada in North America to the tip of South America and on the islands of Fiji and Madagascar. Iguanas range in type from the tree dwelling arboreal type to the terrestrial and the semi-aquatic type.