Modifying the scales
Lizards belong to the suborder Sauria and includes geckos (Family Gekkonidae), iguanas (Iguanidae), chameleons (Chamaeleonidae), skinks (Scincidae), worm lizards (Amphisbaeridae) and monitor lizards (Varanidae). They have all enhanced their water-tight integument with the development of scales, which have become highly modified. The Australian shingleback skink (Trachysaurus) has stout polished scales, the Gila monster (Neloderma) has round pink and black ones (and has additional protection by being venomous) and the horned lizards occurring in arid areas have enlarged them into spiny appendages which are scored with fine grooves which allow dew to condense on them and be collected in the mouth. Spines in the chameleons have also become horned with one to four occurring in the head region. The scales on the underside of the toes of geckoes have become highly modified with numerous microscopic hairs (lamellae) which enable them to climb smooth surfaces (including glass) with relative ease by each hair engaging on the smallest irregularity of the surface.