While it's true that temperature could be a determining factor it doesn't have to be. Many species of tropical izards have established themselves in Florida over the last few decades. Anoles, Wall Lizards and Iguanas to name a few. Cold snaps kill off some but not all and they have a very well established foothold. The same could be a possibilty for monitor species. I am by no means an expert but it seems the numbers reported by the biologist would be too great for just escaped pets.

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