Australian White Cockatoos Dwindling Numbers

In the 25 plus years that have passed i have seen these white cockies go from well over 100 birds to what i saw/video today, less than 6 by looks of it. The birds are migratory, i guess you would say, travelling the state, using same route going from one area to the other but the natural rural habitat has been destroyed by bad farming practices of the past and more recently drought and bushfires. Now, past 30 plus years they have been driven into urban areas in search of food and water and treats such as the conifer nuts in video.