Smaller brownish-black cockatoo of eastern Australia. Male fairly plain except for bright red tail panels. Female has blotchy yellow patches on neck and face and orange-red tail panels. Large bill used to feed on Allocasuarina and Casuarina seeds. The species is entirely dependent on these trees, and recently chewed seed-cones are good indicators of their presence. Usually observed in small groups rather than large flocks. Calls include drawn-out notes with a rougher, croakier tone than Red-tailed and Yellow-tailed Black-Cockatoos.