I was just trying to find out about this but all I got was that this brolga (Delilah) is still alive and now at Werribee. She was hatched (wild) in 1965 so is now about 50 years old. I couldn't find out if she ever bred at the zoo (I have a feeling the Auckland pair was bred at Healesville rather than the zoo, but I don't know for sure).Apparently the oldest animal at Melbourne Zoo in 2012 was a Brolga that arrived in 1966 (making it at least 46 years old). I wonder if this was a parent of either of the Auckland birds.