I can't say I've ever seen large birds in a flock until today. I can't say for sure what type of bird it was. It wasn't a vulture or buzzard, it appeared to be some sort of eagle or hawk. But I've never seen eagles or hawks mass together beyond a couple. I was in my room watching a movie and I see a large bird fly by the trees outside my window. Then another, same type. Then two more, then three more, then another one. In the end I think I counted 12 of them. About half way through I walked out to my porch to see if there was actually only a few that were circling. But they weren't. There was really just a bunch of these large birds flying away in a relatively straight path.
Had I seen any animals on the ground running in the same direction I may have decided to pack up and leave, fearing an earth quake or flood. But in all seriousness it felt very strange seeing these large birds all flying together like that. I've never seen it before.