In my 20+ years in the roofing business I’ve witnessed a lot of crazy reasons for holes on a roof; Birds, kitchen utensils (thrown from higher roof sections), needles, bullets (YYZ), icicles falling from support wires, heck… even groundhogs burrowing into a roof! But one of the most intriguing theories I’ve heard in recent years is meteor strikes.
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Bird excrement in large enough quantities can pose substantial biological hazards. The fungus that grows in pigeon excrement for instance can cause Cryptococcosis and Histoplasmosis disease. An accumulation near an HVAC intake, (where birds often tend to seek shelter) at a hospital, for instance, could pose a potential health risk for the building occupants.
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