Geckos require egg-laying sites, adequate supplies of arthropod prey, and retreats that protect against temperature extremes and predators, all of which can be found in a diversity of habitats. In arid zones, geckos often occupy narrow rock crevices or else they burrow, creating shallow tunnels or occupying those of other animals in sandy soils. A few species, such as the web-footed gecko (Palmatogecko rangei), are specialists of dune faces. Some arid-zone geckos and pygopods live and forage in grass hummocks. Humid tropical forest habitats also are used widely by geckos, which may live on the trunks or branches or in the canopy of trees, under rotting logs, or on rocks along streams and rivers. In savannas and grasslands geckos are less numerous and often patchily distributed, using trees, rocks, or termite nests as shelter. A small, but conspicuous minority of geckos favor the walls of buildings or other manmade structures, where artificial lighting attracts insect prey.
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