A pair of Gang-gang Cockatoos flew into a tree on the northern side of the hill. The male, at least, was calling while he was in the tree. I could also hear other Gang-gangs around on the same side of the hill but I could not see them. The pair stayed in that tree for a while before flying to another tree about 100 metres to the south-west. They spent more time in this second tree than they had in the first tree. The female found the crook of a branch that she started chewing at that seemed to allow her to put half her body in but the branch did not seem large enough to be able to support a decent hollow. The female extracted a bit of wood that she kept chewing on while she perched on a different branch.