The 3 species around the genus Zanda are variously regarded as two, then as a person species for quite some time. Inside a 1979 paper, Australian ornithologist Denis Saunders highlighted the similarity in between the shorter-billed plus the southern race xanthanotus to the yellow-tailed and dealt with them as one https://remingtonkznym.isblog.net/considerations-to-know-about-licensed-cockatoo-breeder-uk-53789070