On 17th August, I found the galahs (a pair), investigating the school nest hollow. They didn't enter, so I assumed gliders were in residence (final photo). Last night we walked past at 6pm - and there was a galah, resting inside the hollow! This morning, there was a male comfortably looking out. From this, I assume the galahs have begun incubating. While I was there, a pair of gang-gangs briefly visited the area, then flew off