Back to your original question, you might want to try a Google search, possible ultrasonic pest repellelers might work. You could look around your yard to see what is attracting them, and possibly remove or trim? There are devices utilities use (with mixed success) to control squirrels, these typically look like 2 or 3 inch spike strips that are about 10 feet long. You would attach along the roof line of the birdcage. It will not stop them climbing the sides but might keep them of the top.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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