They are building like crazy in the area were I live and on top of this crane is a 'scare off bird'-thingy. Do you see it? It has a sound also... First time I heard it I thought there was a bird of prey outside and was ready to rush out with my camera. But the sound was repeating itself in a strange loop so I smelled a rat... For a while there wasn't a single bird outside, but now I think they have come to the conclusion that the sound isn't from a real bird, because they're back...