NORTHERN HOLY CROSS FROG Notaden nichollsi Parker, 1940
This medium frog grows to 6 cm , and is found in most arid parts of the northern half of Australia. It is usually found in red or black soil areas after heavy rain, and is one of the dominant frog species where it occurs.
The Northern Holy Cross Frog has a call 'oo-oo' which sounds pigeon-like, and breeds in waterholes formed after the heavy rain.
There are related species found in most of the drier parts of Australia.
Although a water-holding frog, the Northern Holy Cross Frog is not used by the aborigines as a water source in droughts because it is small and exudes a thick smelly substance when agitated, which when dry becomes strong and elastic.
When this species breeds, its' tadpoles develop rapidly to metamorphosis.

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.