I got attacked by one of these when I was loading a dump run at 630 in the morning, caught movement out of the corner of my eye and it barely missed me. Figure it was probably trying to scare me away. It didn't come by for another pass I don't think.
Had one of these guys land in a tree right above me one night and started that screaming sound 12 feet from my head. Can I tell you, that sound is terrifying in the middle of the night when you are not expecting it and it is that close...