The Long-billed Corella is a cockatoo native to Victoria and SA where it is now becoming uncommon in the wild. Feral populations from aviary escapes exist in a few Australian cities, including Sydney. The first three photos are of wild birds in Southern Victoria and the last is a feral bird in Sydney. They are closely related to the Little Corella, which is also present as a feral bird in Sydney, but are larger (38-41 cm for Long-billed against 36-39 cm for Little), have more red around the eyes and throat and a longer bill. As with other corellas, they use their bills to dig for roots, bulbs and seeds.
1: Monash University, Victoria, 27/04/2012.
2-3: Monash University, Victoria, 17/12/2010.
4: Centennial Park, Sydney, 28/02/2010.