This is a curly tail lizard (Leiocephalus carinatus) that was basking in the morning sun to energize its body for a day full of hunting small invertebrates and lizards. They are called curly tail lizards because they raise up their curled tails to predators to confuse them and make the lizard look bigger, giving the lizard an extra second to get away and seek cover. .
There are almost 30 species of curly tail lizards in the genus Leiocephalus, and all are naturally occurring in the Caribbean island. However, I found this one in the Florida keys, and is just another example of the long list of non-native reptile species currently inhabiting South Florida. Although this ~5 inch long lizard appears to confer little threat, they have been documented to wipe out entire populations of anoles in the Caribbean, and similar interactions are bound to take place in Florida whether we recognize them or not. - 33 minutes ago