|"Aren't I pretty? ...|
That looks like a suitable nest-hole over my left shoulder"
He/she would go to the lower edge of the sizeable hole but quickly jump/fly back to hang onto the small branch just a metre away. Indeed, the hole looked eminently suitable.
|"Just our size."|
|"What's this plugging up the hole?"|
He/she flew over again but a squabble started out with lots of cockatoo "raucous screeching" Simpson & Day and a strange hissing, asthmatic growling which I realised was a Brushtail Possum. A careful look at the photos above will show the black fur [of the tail, I think] in the entrance. Can't be too deep a hole! At one stage the ears and face of the possum appeared.
|Possession is nine tenths of the law.|
|Possum 1: Cockatoo 0|
End result? The cockatoo flew away to look for another hole.
Magic. f8 and be there.
PS. Note that a brilliantly white bird is hard to expose!!