As the evening rolled in, so did the gang gangs. At first I saw a number of males without females, then females, and then I saw pairs flying around the area (I keep wanting to write 'couples'). About 6 gang gangs snacked on this acacia (?) type tree in a back yard. I then observed a male chewing bark around the hollow of site 21, and trying to fly into the hollow (where cockatoos are currently nesting). I did not see a female at this point, but did see another male (green and red head).