Hehe, cats hunt them, sometimes with some cats, the lizard gets killed, but most of them survive cat attacks by staying still until the cat loses the interest and the tough scaly skin protects them meanwhile. I saw them eat mostly flyes, ants and various wormlike things, worms, small centipeds or some larvae ... I don't think they do any harm, at least I didn't hear anything about that. To only real pest in this area is the big apartment houses building a business, this is like locusts, they buy terrain, build big ugly boxes with no green and barely a parking place, half of those apartments are sold to people that are dreaming & trying to make a lot of money in the very short tourist season and a half or more stay empty for decades, the building is low quality and in few years it shows ... the result - pseudo urban growth with no trace of some real development or long term benefit ... and pure architectural ugliness.