I poled the hollow in which the Male gang-gang s sitting - it was bare and empty with no wood chip. Both he male and female where sitting on the branch just outside the hollow that the female went into. This hollow is about 10cm higher than the limit of my pole. With two people it may be possible to hold teh pole up and look into the hollow but I couldn't manage it on my own - but this seems to be the main hollow if one is present.