I also saw a female poke her head into the hollow I have previously reported at https://canberra.naturemapr.org/Community/Sighting/4184443. You can see from the photographs she did not put her head in far. There was a male around as well. They flew to a different tree at about 8 AM from the southern side of Red Hill. The female then flew to the hollow in the photograph, where she put her head in the hollow, withdrew it, looked to both sides then flew to a nearby tree. She was not at the hollow for long, probably less than a minute. She kept calling from a nearby tree and I hoped that noise was to entice some nestlings out but I did not see any movement in the hollow, even though I waited for about 10 minutes. While I was watching the tree, at different times, a pair of Crimson Rosellas and Eastern Rosellas landed near the hollow without any reaction from Gang-gangs.