Nephrurus levis, commonly known as the three-lined knob-tailed gecko, smooth knob-tailed gecko, or common knob-tailed gecko, is a native Australian gecko species.
A robust, medium-sized gecko,with a large, triangular head. It has a short, flattened, carrot shaped like tail, that ends in a knob. This tail can be autotomised to distract predators, however unlike other lizards they have only one cleavage point at the base, meaning it must sacrifice its whole tail in the event. It has long slender limbs with non-retractile claws on digits, of which the outer most one is opposable. The gecko has vertically slit ears at the widest part of its head and very large eyes that have vertical pupils. On the dorsal side, it is generally a pinkish-grey to purplish-brown colour, with a unique pattern of darker and lighter spots, bars or lines. The underbelly is white. N. levis is speckled in pale and dark tubercles on the body and tail which often form bands. Levis means smooth, referring to the skins smoothness compared to the genotype of N. asper (asper meaning rough).
Generally, N. levis are around 8–10 centimetres (3.1–3.9 in) long from snout to vent. The original tail (if not dropped) is usually around 2 centimetres (0.79 in). Males are usually smaller than the females, with both being able to live up to 15 years in captivity.