I initially saw a male Gang-gang Cockatoo perched on the main trunk of a tree where there is a hollow, it was the male with the black tuft in his crown. I had seen him previously at another tree nearby, so I thought he had occupied this tree instead. I also noticed the female in the tree. As I was photographing them another male emerged from a hollow in the tree and a few calls sent the pair I had been photographing flying straight to the tree I had previously seen them in. The pair who left that first tree were the same birds I saw the previous week. The male has a black tuft in his crown while the female has a damaged left eye. The male inspected a long broken hollow on the tree while the female went to the horizontal-facing hollow. She eventually went inside, turned around to return to the entrance again. I am unsure if they are nesting but they seem to be returning regularly to this tree.