However the Marbled Gecko and other species usually live under loose bark or under stones, some even live in spiders burrows. So maybe you can see why our houses look appealing to some.
They dine on a wide range of fare like insects, spiders and scorpions, but they also will partake of fruit, nectar and sap. Some large species will even eat smaller geckos. However, not all geckos have it all their own way. I have found geckos entrapped in the tangled webs of Redback Spiders, which I understand will also eat them.
You can see by the photos below how dexterous the Marbled Gecko is, being able to firmly grasp objects, or stick like glue to smooth vertical surfaces, it will even use its tail for additional traction.
The Marbled Gecko have an interesting color variation, namely (with some animals) red patches on the tail. However most geckos in my area are without these markings, but it has been noted by Herpetologists that they are particularly common on juveniles. I have seen many juveniles and adults without any noticeable tail markings, so personally I am not convinced that they had them as juveniles or lose them at maturity, but more likely a color variation that for some reason, is only applicable to a minority of animals.
Soft Spiny-tailed Gecko, Strophurus spinigerus subspecies inornatus
So next time you see a cute little gecko with big eyes and a worried expression on its face, remember if you were only a couple of centimetres high, it would probably eat you. However, except for science fiction, this is not likely to happen, instead they will do you the favour by eating all your nasty creepy crawlies.