TexasCHLforum.com

Used to work property management for a large bank with locations in all major Texas cities. We had problems with grackles in every city from Harlingen to DFW. They would roost in the overhang above the drive-thru banking lanes and ATMs and deficate EVERYWHERE. Unbelievable stench - ground would literally be covered with white feces to the point you could not see the black asphalt below. One branch manager used to joke "They go to McDonald's (across the street) every morning to make a withdrawl, then fly over here to make a deposit"

We tried everything - netting to keep birds out from under roof overhangs, metal spikes on roosting surfaces, scarecrows, noise-makers, pneumatic air systems that were supposed to flutter like a larger animal and scare them away. Nothing worked.

Then my boss convinced higher ups to buy something similar to one of these ... http://aviandissuader.com/" onclick="window.open(this.href);return false;

Took a while - sending guys out every night for weeks to shine the giant golf-ball diameter laser beam at the birds. But it did the trick. Got them off our property for a season - usually had to redo the "treatment" each new season as newer, dumber, uninitiated birds would take up residence.

What's funny is that I now notice other bird-prevention treatments in other locations. I saw netting and spikes on the Supreme Court building and one of the Congressional office buidlings in Washington DC about 6 years ago when I was there.