After walking for a bit following the line of waterholes east from the main one I finally came to one where I could set myself up with the right light and access.
But I was surprised to see a lone Brolga having a rest in the shade of the acacias along the dusty bank. I took a few shots at a respectful distance then skirted around it to my spot.
Eventually it seemed to get curious and moved closer to my possie. Then it moved into the water and started foraging.