PSITTACIFORMES: Cacatuidae
Calyptorhynchus baudinii
Also known as the Long-billed Black-Cockatoo.
We stayed overnight at the Stirling Range Retreat. First thing in the morning a flock of these guys flew into the gum tree outside our lodgings and within a couple of minutes a shower of leaves and flowers rained down carpeting the ground and our car. The birds then flew off, no doubt to find another hapless tree.