FAT TAILED DIPLODACTYLUS Diplodactylus conspicillatus Lucas and Frost, 1897
Common throughout most drier parts of Australia this gecko attains 9 cm.
The dorsal colour is highly variable, but the distinct body form of this gecko makes it easy enough to identify. Occupying most habitats where it occurs, this species is a ground dweller, sheltering under ground debris or in burrows under spinifex bushes during the day.
By night it forages in the open for insects. The distinctive fat tail is used as a food and water store during times when these are scarce. The tail is also used to plug its burrow when retired during the day. When caught by a predator, this species will puff up its body in a bid to make it harder to swallow.

The above was from the book Australian Reptiles and Frogs by Raymond Hoser and now available on a fantastic CD-Rom along with a vast amount of other information, papers and the like on reptiles, frogs and other wildlife.