The female was sitting in the entrance of the hollow and the male nearby. She came out of the hollow and appeared to be covering the entrance with her body for some time. There were several ravens in the area and when one landed just above the hollow the GGs flew off to another tree. They were all still in place when I left.
After yesterday's raven scare, the female was back beside the hollow this morning. She was talking softly, presumably to the male who was inside again.