Along with other escaped or released exotics, iguanas have thrived in south Florida. Last time I was in Miami, I saw some huge ones. This from a news story about the cold weather:
"Freeze warnings covered nearly all of Florida with temperatures expected to drop into the 20s overnight. Freezing iguanas were seen falling out of trees in Florida; experts say the cold-blooded reptiles become immobilized when the temperature falls into the 40s and they lose their grip on the tree."
I guess if you have a use for them, or a taste for them, this makes catching them easy.