Where did all the parrots go on Tablelands Road near Wentworth Blue Mts.

In February of 2009 Tablelands road was a jackpot for me as I filmed. Yellow-tailed Black Cockatoos calling everywhere and flying about. Several views of Gang-gangs. Even some fantastic encounters with Glossy-black Cockatoos. This time weather was cold , I heard one very distant Yellow-tailed black. No Gangs whatever, and some Crimsons but not a great deal of them. The only lovely thing was connecting again with Glossies and watching and listening to them feed for over an hour! I heard fires might be an issue but maybe its time of year? ????? Thanks for imput. PS: Found a double eyed fig parrot nest today in Cairns! the highlight of my day. Don