Gecko

Article summary

Geckos ( ) are small, mostly carnivorous lizards that have a wide distribution, found on every continent except Antarctica. Belonging to the suborder Gekkota, geckos are found in warm climates. They range from in length. They are the most species-rich group of lizards, with nearly 2,000 different species of geckos existing. Geckos are unique among lizards for their vocalisations, which differ from species to species. Most geckos in the family Gekkonidae use chirping or clicking sounds in their social interactions. Tokay geckos (Gekko gecko) are known for their loud mating calls, and some other species are capable of making hissing noises when alarmed or threatened. All geckos, except species in the family Eublepharidae, lack eyelids; instead, the outer surface of the eyeball has a transparent membrane, the brille. They have a fixed lens within each iris that enlarges in darkness to let in more light. Since they cannot blink, species without eyelids generally lick their own brilles when they need to clear them of dust and dirt, in order to keep them clean and moist. Unlike most lizards, geckos are usually nocturnal and have excellent night vision; their colour vision in low light is 350 times more sensitive than human eyes. The nocturnal geckos evolved from diurnal species, which had lost the rod cells from their eyes.…

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