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There are so many birds here though, always moving, I may as well just buy a siren and leave it on 24/7.

lol, but that would be annoying too.

I had one that would sit on the edge of my truck window looking at itself in the side mirror. Every time I would go to get in the truck there would be bird poop running down the side of the truck door. I think the bird was nuts, it would sit there and just peck the mirror for hours....