As I was taking the garbage down to the dumpster today, this is what greeted me: I do not know enough about them to say if they are indigenous to Puerto Rico, but they are everywhere in the center of the island. They can grow to be seven feet long (including the tail.) The one I encountered today was about five-ish. They are MEAN! The one at the dumpster tried to whip me with its tail. There are usually several of them that scatter upon approach, but today there was just one big one and he was not about to punk out. He puffed up and brought his tail to bear on me. Any crazy wildlife where you live?