A young male and an adult male were both seen entering and leaving the hollow, as well as tending to the edge. Four hollows in 3 trees were being investigated by gang gangs in the vicinity of the main tree. The group ranged up to about 8 to 10 or so birds in the vicinity.
We will check this tree out in the next two weeks - may be a hollow that holds water and Gang-gangs are using it as a drink tree - about 9% of 192 Gang-gang hollows of interest that we inspected last season were flooded