From 7.42-8.30pm - Spotted a gang gang pair siting in high branches. Moving from branch to branch. Making relatively quiet noises to each other. The male moved to branch just below hollow. Female moved to branch just above hollow. Then both flew off to other branches. There was a bit of chatting & noise. Then both moved back to branches close to hollow. Female flew into hollow and then came out and flew to another tree nearby. At 8.28pm the male flew to the hollow & disappeared inside after a few squawks.