Reptile experts say when temperatures fall below 40 degrees the lizards go into a type of hibernation and their bodies essentially turn off. When the mercury goes back up, the iguanas are revived.
"It's almost like they go totally to sleep. Generally speaking, if it warms up quickly afterwards, they can recover, but sometimes smaller animals will not recover. I knew of a gentleman who was collecting off the street and just throwing them in the back of his station wagon, and all of a sudden as he's driving down US1, these things are coming alive, crawling on his back and almost caused a wreck," said Ron Magill from the Miami Metro Zoo.
Iguanas were introduced to Florida by pet owners and have since become one of the state's most invasive species.