Female was observed at the hollow. I scanned around for the male and couldn't find him..he eventually emerged from the hollow. This tree is opposite one of the sites we've surveyed as a productive nesting site.
Thanks CT1000 about two weeks ago while spraying verbascum in this area I noticed a pair of Sulphur Crested Cockatoos and a pair of Gangs Gangs squawking at each other and swooping each other at this same hollow for about 30 minutes