There has been a dynamic change in their foraging ecology over this time with flocks now moving well out onto the coastal plain almost to the coast. Their local movements from the hills onto parts of the Swan Coastal Plain and their food and social organisation have also been studied over this period. naso in the Perth hills slowly gaining knowledge of their nesting areas, nest sites, breeding behaviour and timing of nesting attempts. Over the past 10 years the WA Museum has been studying the breeding biology of the Forest Red-tailed Black Cockatoo C. She leaves the nest once or twice a day to be fed by the male. The single egg is laid on woodchips at the bottom of the hollow and only the female incubates and broods the chick. They breed in large chimney-stack type hollows of mainly Marri, but also Jarrah, Karri, Wandoo and Bullich trees. The loud grating "kar-rak" call is very distinctive and carries for some distance. The female (R) has orange-yellow barring on the breast and undertail. The male (L) is glossy black with a bright red panel in the tail. Despite these being large conspicuous birds, very little is known about their breeding biology. In many hills areas the cockatoos you see are from an ageing population with little recruitment back into the flock. These birds live for about 50 years, begin breeding at four years of age, mate for life and tend to nest in the same hollow each breeding season (generally every 2 years). Juvenile and immature birds are similar to the female and adult plumage is acquired at four years of age. The female is mostly black with the head and wings spotted with pale yellow, the breast and belly barred with orange-yellow, the tail narrowly barred with orange-yellow and black and the bill greyish white. The male is glossy black except for a bright red band towards the tip of the tail and it has a blackish bill. Red-tailed Black Cockatoos have strong sexual dimorphism (sexual differences). Only naso the forest form is listed as Vulnerable as its overall distribution and population have declined greatly over the past 50 years. naso restricted, or endemic, to the Jarrah, Marri and Karri forests in the south-west corner of the State. samueli found in the arid zone (Pilbara, Gascoyne and northern Wheatbelt), and C. There are three subspecies, or different populations, of Red-tailed Black Cockatoo in Western Australia Calyptorhynchus banksii macrorhynchus found in the Kimberley, C. Known by the Noongar people as "Karrak", this spectacular cockatoo was named Calyptorhynchus banksii naso by John Gould in 1837 the name naso refers to the nose in reference to the large bill in comparison to other populations of Red-tailed Black Cockatoo.
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