Under 4 degrees, their blood stops moving as much, Sommers said.
He suspects that, within a couple of decades, iguanas will creep north because they will be able to withstand colder climates. The iguanas are likely not dead, experts say, but merely stunned and will reanimate when they warm up.
Lizards are falling from the sky and sea turtles are washing onto land as temperatures plunge in Florida, where snow fell in the capital Wednesday for the first time in almost three decades.
"Like any wild animal it will try to defend itself", she said.
"Neighbourhoods resounded with the thud of iguanas dropping from trees onto patios and pool decks", Sentinel reporter David Fleshler wrote.
"When the water temperatures drop, stunned sea turtles may float listlessly in the water on or near shore", the Florida Fish & Wildlife Conservation Commission tells the Herald.
"All of a sudden these things are coming alive, crawling on his back and nearly caused a wreck".
According to the Sentinel, iguanas arrived in Florida first as pets and, once they escaped or were freed by their owners, they first moved into Miami-Dade County in 1966, then to the Keys in 1995, before making a home of Broward County in 2001 and Palm Beach in 2003.
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