The three species within the genus Zanda have been variously regarded as two, then as one species for very some time. In a 1979 paper, Australian ornithologist Denis Saunders highlighted the similarity between the brief-billed and also the southern race xanthanotus to the yellow-tailed and addressed them as a single https://travisgufov.blogkoo.com/the-best-side-of-umbrella-cockatoos-55882196