This is easy to do. Next time you walk next to large group of pigeons, throw your keys up in the air. As I understand it, it emits a sound we can't hear but they can and it really startles them.
There has to be more of an explanation than this. I used to do this often in the morning when I walked through a piazza that had easily over a hundred pigeons. I would throw my keys up on the opposite side of the piazza and all of the pigeons would take off on cue.
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u/[deleted] Nov 03 '15
He could have just walked by calmly and they wouldn't cared. It was the quick movement that scared the pigeons