No, there are no venomous lizards in Florida. Matter of fact, there are only two venomous lizards in the world that I am aware of. Mexican beaded lizard and the gila monster, both desert dwelling creatures. Some evidence points to the komodo dragon being possibly venomous but some think it is just the bacteria load in the mouth combined with a powerful anticoagulant in the saliva.
But you are not very likely to run into any of those critters.
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