Last night I was suddenly awakened to the sound of my flock thrashing about in their cages. I went out to see what had terrified them, but couldn't find anything wrong. Then, 2 minutes later, a very short, quick jolting earthquake occurred to which my birds again began frantically flailing around in their cages. Teak, my meyers parrot, was so terrified that she spontaneous released all but 2 of her tail feathers, poor thing.
I find it quite fascinating that birds become alerted to an imminent earthquake.