Green Anacaondas have been found in South Florida. But, they are not believed to have an established breeding population. Same with African Rock Pythons and Retics.
https://edis.ifas.ufl.edu/uw334
Florida has a good climate for a lot of animals. We also are a gateway to the US from the world and a lot of exotics escape here. We had a couple of Nile crocs get away and one is still swimming around out there.
A list of established invasives show mostly lizards when you click on the reptile link.
The only constrictors known to have an established breeding population in Florida are The Burmese and the Common Boa. The other two species one is a Javan File Snake and is aquatic. The other is a Brahminy Blindsnake. The blind snake is tiny and my son brought on in thinking it was a worm one day. I spend a lot of time in the Glades region and I have never seen either of the 4 species listed. I have talked to a couple of people who have and they had a picture of python at the check station in Berar Island that they said was found in Big Cypress National Preserve. It was about 4' long.
I most frequently see water moccasins. Next most frequent would be black racers.
I grew up around constrictors as our pets and have posted pics on here of my son's scout group with our python "Miss Piggy" who was 13' at the time of the picture.
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