'They're not dead': Falling iguana alert in Florida amid cold snap

But the invasive species may have met their match in an unusual cold snap which sent thermometers plummeting in Florida, rendering the cold-blooded reptiles paralyzed.

"This isn't something we usually forecast, but don't be surprised if you see Iguanas falling from the trees tonight as lows drop into the 30s and 40s. Brrrr," tweeted the National Weather Service in Miami. That is between -1 and 4 degrees Celsius.

Such conditions are unusual in the normally balmy US state, where winter temperatures typically don't fall below 65 degrees Fahrenheit (18 degrees Celsius) or so. 

Many people don't have the proper heating at home or clothing to cope with the freezing temperatures -- something also true of the state's animals.

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An infographic attached to the tweet added that although the cold-stunned creatures may appear to have met their end, "they are not dead." 

Last January, another cold front saw a similar deluge of frozen iguanas, with members of the public sharing pictures on social media, and bringing them home to defrost -- something authorities discourage since the wild animals may attack humans once revived.

The species isn't native to Florida but was brought in by travelers from Central and South America in the 1960s.

The Florida Fish and Wildlife Conservation Commission has declared open season on the iguanas, writing on its website that it encourages homeowners to remove them from their property, while killing them on public lands is permissible without a license.