I walked past the trees where the Dollarbirds normally are at this time of year. There was a lot of calling and I visually counted three birds, with a possible fourth calling but not readily visible. I am guessing it was possibly two pairs. There seemed to be times of louder, accelerated calling, which I took as an effort to establish ownership of a nesting hollow. I had a good scan of two trees with binoculars, looking from the east, but I could not see any hollow. The photos show the three different Dollarbirds, not that I can tell them apart.
Great photos thanks. A pair is definitely nesting here. Yesterday I was swooped fiercely four times in a row when I stopped to take a photo. They were there again this evening as usual. They have been in these trees consistently all summer and also last summer.