The pair arrived in the vicinity, announced by calling, paused a few minutes before the male alighted at an adjacent tree. He entered the hollow and disappeared. After some minutes the female alighted on the tree to inspect the hollow, the male emerged and remained perched at the hollow. The female examined all around the outside of the hollow and did some gnawing. He preened and she preened him. All up about 10 min. He then flew to 51 and entered the hollow, she perched nearby. He spent about 5 minutes inside. She didn't land on it. After about 10 minutes they both flew off.