 Ah, it's a full blown panic attack, man. Get that bird out of there. Of course, I'm not a bird psychologist, so I cannot really tell what was going on here. But I don't think we need to be in order to tell that this bird was clearly in distress. It was clearly screeching and screaming. Maybe it was mimicking something that it perceived. Even science will tell us that certain animals can perceive things that we cannot.