Iguanidae: Iguana

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Iguanas are a group of large, land, rock and tree dwelling lizards in the Iguanidae family.

Debate exists regarding the scientific classification of Iguanidae species. Loosely speaking, discussions of native iguanas in the United States often refer to species in two genera: Desert Iguanas (Genus Dipsosaurus); and Chuckwallas (Genus Sauromalus).

A small population of Rock Iguanas from the Caribbean (Genus Cyclura), along with Spiny-tailed Iguanas (Genus Ctenosaura) from Mexico and Central America, have been introduced into the United States and can sometimes be found in the wild.

Unlike their lizard relatives, iguanas are herbivores, consuming plant life.

During the day they bask in the sun and rummage for food. At night most species sleep in burrows or under natural crevices from rocks.

A couple of iguana species are arboreal, living their lives in trees. Residents of Key West Florida have discovered that cold spells can wreck havoc on their non-native Green Iguana population. During nights when temperatures drop below 40^oF, the iguanas have a habit of turning gray and falling off the trees. When they sun comes up and the weather warms, most iguanas break out of the stupor and resume their normal tree life.

Many iguanas, like the Cuban Rock Iguana in the top picture are characterized by the crest or scales that run down the back.

© 2008 Patricia A. Michaels