White-Tailed Black Cockatoos. There was a flock of them in the park next to our house in Kallaroo, just north of Perth. It was great fun chasing them around but quite difficult to get good shots with the telephoto lens. They were very active.
There are two varieties of White-Tailed Black Cockatoo, Carnaby’s (short-billed) Cockatoo and Baudin’s (long-billed) Cockatoo. They are difficult to tell apart unless you can get close enough for a good look at the bill. I suspect these are Carnaby’s Cockatoo but I’m not sure.
They are only found in the SW of Western Australia and the species are both endangered.