Gecko foot hairs. Coloured scanning electron micrograph (SEM) of hairs on the underside of a gecko's foot (family Gekkonidae). These microscopic hairs enable the gecko to cling to very smooth surfaces such as windows and ceilings. Geckos are slender nocturnal lizards. They feed on insects and are found in a wide range of habitats, from deserts to rainforests. Magnification: x595 at 6x7cm size.