Further along the north slope of the hill I came across another Gang-gang Cockatoo pair. They were originally in seperate areas of the tree with the male chewing at a shallow hollow. They eventually arrived on the same branch where they commenced some mutual preening. The male then flew to a different branch where he continued to preen himself and appeared to stretch his right wing out, but did not repeat the process with his left wing. They did not react to other parrots around them but did look when they heard other Gang-gangs calling. After one lot of calls from other Gang-gangs this pair flew to to a different tree that appeared closer to the noise. No hollows were apparent in either the first or second tree. These birds eventually flew off to the north-west after about 15 minutes but I could not see where they went to.