I was watching another hollow 100m to the east when an answering call was given to the pair I was watching. I went and checked direction of noise and found this pair in a Red gum tree. the male walked around the rim and inspected a hollow, while both birds chewed bark on the trunk on which the hollow is in. After 10 minutes they flew to the west towards the golf Course. A related sighting ishttps://canberra.naturemapr.org/Community/Sightings/Details/4247251?success=true