Henrik Grönvold del.
1. Cacatua tenuirostris female; 2. Cacatua galerita male. 3,4 - hybrids
J.Green Chromo.
Date 19 June 2014, 18:44:14
Source Annals of the Natal Museum, vol 3, 1919 http://www.biodiversitylibrary.org/page/6325897#page/38/mode/1up
Author Ernest Warren, 1871-1945 (month unknown)
Source: https://commons.wikimedia.org/wiki/File:Cacatua_galerita_and_C._tenuirostris_-_parents_and_hybrids.jpg

The long-billed corella (Cacatua tenuirostris), or slender-billed corella is a cockatoo native to Australia. The long-billed corella can be found in the wild around western Victoria and southern New South Wales.

The sulphur-crested cockatoo (Cacatua galerita) is a relatively large white cockatoo found in wooded habitats in Australia and New Guinea and some of the islands of Indonesia.