Arrived at this site at 7.15pm when the female emerged from the hollow and the male was perched in a nearby tree. She sat there for a minute before going back into the hollow. She did this again 5 minutes later. The pair called to each other softly. At 7.30pm the male flew to the hollow and the female came out. They interacted with each other for about 30 seconds and then the male entered the hollow. The female flew off. I could hear young begging/being fed in the hollow.