Nephrurus levis, commonly known as the smooth knob-tailed gecko, is a native Australian gecko species. The smooth knob-tailed gecko is part of the Carphodactylidae family, a family endemic to Australia. A common, alternative, name for this family is barking geckos due loud barks they make during threat displays, which includes swaying their bodies, winding their tail and attacking with an open mouth. There are multiple sub-species of Nepururus levis, these include N.l. levis, N.l. occidentalis and N.l. pibarenis. Its aboriginal name is Illchiljera.