High Quality Content by WIKIPEDIA articles! The Red-tailed Black Cockatoo (Calyptorhynchus banksii), also known as Banksian- or Banks` Black Cockatoo, is a large cockatoo native to Australia. This species was known as Calyptorhynchus magnificus for many decades until the current scientific name was officially conserved in 1994. It is more common in the drier parts of the continent. Five subspecies are recognised, differing most significantly in beak size. Although the more northerly subspecies are widespread, the two southern subspecies, the Forest Red-tailed Black Cockatoo and the South-eastern Red-tailed Black Cockatoo are under threat.