The very next day I saw them from our house!
It was a very blue-sky weekend. Sparkling clear, not very warm in the shade but unbearably hot in direct sun; in that Hobart way. I went out on the back deck in the early afternoon and saw basically a whirlpool of birds in the sky, not far away in the direction of the mountain.
This is over the Cascade paddock, and I imagine they were enjoying thermals coming up off the expanse of golden sunbaked grass.
There were the wedgies, and [at a safe distance] a range of other big and small birds, all going anti-clockwise.
Michael came out and spotted another smaller spiral of birds more south of us, maybe over the soccer ground. They were shining like polished metal – probably just a flock of cockatoos.
* (Elf is secretary of the local progress association, SHPA)