Why Did Birds Vacate the South Station?

The North Station had hordes of pigeons, while the South Station was mostly bird-free. So why weren't there any birds in the South Station?
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Does Ultrasonic Bird Control Really Work? Here's What the Science Says.

Does ultrasonic bird control work? A scientific study conducted by Dr. Whitford showed the dramatic reaction geese have to ultrasonic sound.

How to keep your neighbor's dog from pooping in your yard

How do you keep dogs out of your yard? How do you stop your neighbor's dog from pooping on your yard?