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DescriptionWith its pristine white plumage and striking, bright yellow crest, the sulphur-crested cockatoo is one of Australasia's most recognisable parrot species (2) (4). The crest is erectile and can reach up to 14 centimetres in length (2). The undersurfaces of the wings and tail are washed with pale yellow, while the bill and feet are black and dark-grey respectively. The sexes are almost identical, except for the eye, which is brown in the male and red-brown in the female. There are four recognised subspecies of sulphur-crested cockatoo which are distinguished by location, as well as by differences in body size, bill size, and the colouration around the eye, which is white in all of the subspecies except for Cacatua galerita fitzroyi,in which it is blue (2).