Iguanids are largely lizards of the Western Hemisphere. They range from far southwestern Canada, into much of the United States, throughout Central America and the West Indies, and in almost all of South America except the southwestern edge. Some, like the iguanines, have wide ranges, with representatives from the southwestern United States, Central America, the northern half of South America, and the Galápagos Islands. Others, like the hoplocercines, are more restricted, with species occurring only in tropical South America.

The exceptions to the Western Hemisphere rule are the oplurines, which occur in Madagascar off the southeastern coast of Africa, and a few other species, such as Brachylophus species, that live on the Fiji Islands.

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