We do have some pairs behaving strangely this year, seemingly going through the motions and not yet nesting - but then we have others who already have chicks (incubation is 4 weeks) that started nesting in late October. Gang-gangs seem to delight is disproving any theories that I come up with to explain their behaviour so I'm pretty clueless to explain what is happening in Cook.
It is interesting that they seem quite serious for a while but then don't go on with it. Not sure if this year has been any different with the continuing colder temps.
Thanks - we have been checking yours and other hollow activity sightings from the Cook area - but so far no confirmed nests - though so far this year we have 22 from Canberra and 3 from Queanbeyan - Thanks again for your help - basically for every ten hollow sightings we follow up on we find a nest.