Geckos are lizards belonging to the infraorder Gekkota, found in warm climates throughout the world. They range from 1.6 to 60 cm (0.64 to 24 inches). Most geckos cannot blink, but they often lick their eyes to keep them clean and moist. They have a fixed lens within each iris that enlarges in darkness to let in more light.
Geckos are unique among lizards in their vocalizations, which differ from species to species. They use chirping or clicking sounds in their social interactions, and sometimes when alarmed. They are the most species-rich group of lizards, with about 1,500 different species worldwide. The New Latin gekko and English "gecko" stem from the Indonesian-Malay gēkoq, which is imitative of sounds that some species make.
All geckos except species in the family Eublepharidae lack eyelids; instead the outer surface of the eyeball has a transparent membrane, the cornea. Species without eyelids generally lick their own corneas when they need to clear them of dust and dirt.
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