If it's below 40 degrees in South Florida, the forecast calls for falling iguanas

As temperatures were dipping this week, the National Weather Service issued freeze warnings for much of Florida and Georgia, adding a warning in South Florida for "falling iguanas." University of Florida wildlife ecologist Frank Mazzotti explains the physiology of cold iguanas and why many people in Florida aren't shedding tears for the iguana-cicles lying around the region.

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