Thanks - embarrassment factor 10
But...as with everything else in science, one question answered, raises several more...what do they get from being commensal / parasitic / mutualistic on geckos? Protection, warmer microhabitat, food (old skin cells?) Do they spend their whole lives on the gecko, do they move from one to another ? too many questions, but I'm suddenly interested in the little critters and their reptilian 'islands'.