The Green Iguana (Iguana iguana) is a large, arboreal herbivorous species of lizard of the genus Iguana native to Central and South America. The green iguana ranges over a large geographic area, from southern Brazil and Paraguay to as far north as Mexico and the Caribbean Islands; and in the United States as feral populations in South Florida.
Green iguanas are oviparous with females laying clutches of 20 to 71 eggs once per year during a synchronized nesting period.The female Green iguana gives no parental protection after egg laying, apart from defending the nesting burrow during excavation. In Panama, the Green iguana has been observed sharing nest sites with American crocodiles and in Honduras with Spectacled Caimans.
The hatchlings emerge from the nest after 10–15 weeks of incubation. Once hatched, the young iguanas look similar to the adults in color and shape, resembling adult females more so than males and lacking dorsal spines. Juveniles stay in familial groups for the first year of their lives. Male Green iguanas in these groups often use their own bodies to shield and protect females from predators.
Source: en.wikipedia.org/wiki/Green_Iguana - 01.04.2010
It really looks happy because of bathing in the sun.