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The Red-tailed Black Cockatoo (Calyptorhynchus banksii), also known as Banksian- or Banks' Black Cockatoo, is a large cockatoo native to Australia. The species was known as Calyptorhynchus magnificus for many decades until the current scientific name was officially conserved in 1994. It is more common in the drier parts of the continent. Five subspecies are recognised, differing most significantly in beak size. Although the more northerly subspecies are widespread, the two southern subspecies, the Forest Red-tailed Black Cockatoo and the South-eastern Red-tailed Black Cockatoo are under threat. Adult Red-tailed Black Cockatoos are around 60 centimetres (24 in) in length and sexually dimorphic. Males are completely black in colour, excepting their prominent red tail bands; the slightly smaller females are black with yellow barring on their chest, yellow grading to red spots over their crest, cheeks and wings and yellow-orange tail stripes. - Wikipedia
The species is usually found in eucalyptus woodlands, or along water courses. In the more northerly parts of the country, these cockatoos are commonly seen in large flocks. They are seed eaters and cavity nesters, and as such depend on trees with fairly large diameters, generally Eucalyptus. Populations in southeastern Australia are threatened by reduction in forest cover and other habitat alterations. Of the black cockatoos, the red-tailed is the most adaptable to aviculture, although black cockatoos are much rarer and much more expensive outside Australia. - Wikipedia There were 6 in this flock, spotted in bushland near my home. I heard their 'creeee creeee' call before I actually saw them.