EASTERN SPINY TAILED GECKO Diplodactylus intermedius Ogilby, 1892
Found throughout semi-arid parts of Southern Australia, and the Macdonnell Ranges in the Northern Territory, this gecko attains 10-12 cm. Most specimens are found during the day under tree bark, or in upright tree hollows.
In areas without trees specimens may be caught under rocks. This nocturnal lizard is able to exude a sticky substance from the spines in its' tail when harassed.

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.