Within the genus, the two Western Australian white-tailed species, Carnaby's and the Baudin's black cockatoo, together with the yellow-tailed black cockatoo ("Z. funerea") of eastern Australia form the genus "Zanda". The red-tailed ("C. banksii") and glossy black cockatoos ("C. lathami") form the nominate genus of "Calyptorhynchus". The two groups are distinguished by differing juvenile food begging calls and the degree of sexual dimorphism. Males and females of the latter group have markedly different appearance, whereas those of the former have similar plumage.