its call I have never hard anything like that on our property. My second guess is Common Eastern Froglet (Crinia signifera) which is quite common in the area. However a Frogwatch expert has identified it as Litoria verreauxii- whistling tree frog
The early morning (around 5am) of 21 March was notable for a pretty severe thunderstorm. This dropped 7.6mm of rain on us in about 10 minutes. A first consequence was scouring on the drive.
Switching to Google Earth gives this polygon for the catchment of the gully, which measures 2.8Ha.
(Another way of looking at 212.8 cubic metres is an ice cube 6m to a side!)
After lunch another storm came through dumping 10+mm of rain in short order (taking the day's total to 17.8mm). Here is the gully discussed above shortly thereafter.