 Within the genus , the yellow @-@ tailed and the two Western Australian white @-@ tailed species , the short @-@ billed and long @-@ billed black cockatoo , form the subgenus Zanda . The red @-@ tailed and glossy black cockatoos form the other subgenus , 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 plumage , whereas those of the former have similar plumage . 
