We have a lot of boneheads that come to vacation here. I spoke to an animal control guy one time (after he picked up my dog roaming around chasing geese) and he told me that a lot of people come here with their kids for the entire summer and buy a dog or cat, when they leave they just set it free and it roams around the island. At one time I guess it was a real problem esp in the early fall and he says it still goes on to some degree and it would not surprise me if this is a cat that was once someones pet.
Thanks for your advice. I'll check his ears closely.
That was a great point that Saltheart made about neutering, also check to see if it has been declawed. This should tell you whether the cat was once domesticated. Hopefully this isn't the case, as it wont last long outside without them.