Reptiles
Knob-Tailed Gecko
Nephrurus · also called knob-tailed geckos
A knob-tailed gecko emerges from its burrow after dark, large eyes scanning the desert floor for movement, its short tail ending abruptly in a small rounded knob rather than tapering off like most geckos. That knob is doing real work, storing fat reserves the gecko will draw on through leaner stretches of Australia’s arid interior.
Overview
The knob-tailed gecko, genus Nephrurus, is a nocturnal, burrow-sheltering gecko found across arid and semi-arid Australia. Its short, knob-tipped tail concentrates fat storage, and it is capable of a surprisingly loud defensive squeak when handled.
A tail built like a fuel tank
Where most geckos spread fat reserves along a longer tail, the knob-tailed gecko packs its reserves into one compact, rounded knob, an efficient adaptation for an animal that needs to survive unpredictable stretches between successful nights of hunting.
Status
Least Concern — common and widespread across suitable arid habitat throughout Australia’s desert and grassland interior.
Knob-Tailed Gecko: common questions
Why does a knob-tailed gecko have such an unusual tail shape?
A knob-tailed gecko has an unusually short tail ending in a small, rounded knob rather than the longer, tapering tail typical of most other gecko species, and this distinctive knob serves as a concentrated site for fat storage, giving the genus both its common name and one of its most immediately recognisable physical features.
Can a knob-tailed gecko really make a sound?
Yes, when threatened or handled, a knob-tailed gecko is capable of producing a surprisingly loud squeaking or barking vocalisation, an unusual and attention-grabbing defensive behaviour that can catch handlers off guard given the gecko's otherwise relatively modest size.
Where does a knob-tailed gecko spend the daytime?
A knob-tailed gecko typically shelters within a burrow, either one it has dug itself or one taken over from another animal, during the heat of the day, emerging to hunt only after dark once desert temperatures become more favourable for nocturnal activity.
Why does a knob-tailed gecko have such large eyes?
A knob-tailed gecko has notably large eyes relative to its head size, an adaptation that helps it detect movement and navigate effectively while hunting at night, when most of its insect and spider prey is active across the dimly lit desert and grassland terrain it inhabits.