Thick-tailed Gecko Underwoodisaurus milii

Lizards of Victoria series


The Thick-tailed Gecko, Underwoodisaurus milii, can be recognised by its large head and colour pattern of dark background with numerous yellowish spots. The original tail is narrow at the base, then broadens and tapers over its length. It has a snout vent length of around 100 mm.

Thick-tailed Gecko, Underwoodisaurus milii

Thick-tailed Gecko
Photographer: Peter Robertson / Source: Wildlife Profiles Pty. Ltd.

Distribution and habitat

The Thick-tailed Gecko is widespread across the northwest of the state southwards to the Castlemaine area. It often lives in holes in the ground, although is also common in rocky outcrops in north central Victoria, where it hides under rocks.


A terrestrial species, its diet mainly consists of small invertebrates. Females of this species lay 2 eggs per clutch.

Further Reading

Cogger, H. 2000. Reptiles and Amphibians of Australia. Reed Books.

Wilson, S. & Swan, G. 2003. Reptiles of Australia. Princeton University Press.

Comments (7)

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popereee 21 May, 2010 10:10
would like to point out that is a knob tailed gecko
Michael 14 October, 2012 21:43
Would like to point out that it is a thick tailed gecko not a knob tailed gecko!
CONFUSED 28 September, 2013 19:05
I am confused, what is the difference between a thick tailed and knob tailed gecko??????????????? I need to know for my school project
Discovery Centre 19 October, 2013 10:20
Hi confused, these geckos are two separate species. The Thick-tailed Gecko (Underwoodisaurus milii) is found across southern Australia, including Victoria. The Knob-tailed Gecko (Nephrurus amyae) lives in central Australia and doesn't venture into Victoria.

Thick-tailed Geckos were previously classified as Nephrurus milii, showing their close relationship to Knob-tailed Geckos, but their classification was reviewed and they have since been found to be taxonomically more distinct.


paige 16 January, 2015 14:09
hi I have 3 thick tailed geckos 2 female and one male I was wondering at what age they start to breed
Discovery Centre 18 January, 2015 15:36
Hi Paige, Thick-tailed Geckos (Underwoodisaurus (Nephrurus) milii), also known as Barking Geckos, are able to breed at one year of age and peak in breeding efficiency at about five years of age.


Judy 30 October, 2016 19:58
We found a thick tailed gecko amongst rocks on our property at Muckleford just out Of Castlemaine. Absolutely gorgeous.
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