I've noticed huge gatherings of Rainbow lorikeets(I think) in shopping center trees during windy storms, in early spring to mid spring.
The combined noise of them was deafening. Even though I video recorded them, I couldn't get a clear picture of any without a strong flashlight into the bushy branches of the tree, but I recorded their noisy chattering clearly. I'm not sure the reason, but I guess it's a gathering to protect themselves from the windy storm.