The 3 species around the genus Zanda are variously considered as two, then as a single species for very a while. Inside a 1979 paper, Australian ornithologist Denis Saunders highlighted the similarity in between the small-billed plus the southern race xanthanotus within the yellow-tailed and handled them as 1 species https://umbrellacockatoocoloringp18484.theideasblog.com/37098992/rose-breasted-galah-cockatoo-uk-things-to-know-before-you-buy