A male was chewing bark close to the hollow seen in the bottom left corner of the first photo, and more clearly in the middle of the second one. Just after the second photo was taken he moved onto the branch with the hollow, but had to chase away a cockatoo that tried to look in. He didn't return to the hollow after that but moved to another tree beyond Baldy's original hollow which can be seen in the foreground in the third picture. I didn’t see the female, but he seemed to be ‘talking’ to someone nearby when he was near the hollow. I suspect she was inside.