There was a strange phenomenon in Florida this winter: iguanas were falling from trees.
They were falling because the cold temperatures caused them to freeze. The temperatures in Florida in January reached around 4 degrees Celsius and that’s the point at which they freeze. At that point, they become immobile and are no longer able to hold onto the trees they live in. As a result, they fall to the ground.
Luckily for the iguana, they can survive falls from up to 50 feet so falling from trees usually does not kill them. Once the temperatures rise back up they will regain their energy and go on their merry way.
https://thepetfaq.com/iguana-facts/