I heard some Gang Gangs in the forest and tracked them down to a single tree which had 2 hollows. I first saw the female emerging from a hollow around 20 metres from the ground. She then sat on the edge of the hollow and was chewing around it and putting her head inside it. I noticed that the male was about 10 metres above her looking into another hollow and also chewing around it. They sat there for around 10 minutes and then flew off.