Yet another reason to get rid of those unloved birds. It’s odd to think a bird that we could care less about causes so many problems for us. For one, they’re everywhere which means lots of interaction. In the morning, you’ll find your car covered with their fecal matter. While you are walking on the sidewalk, they drop their excess on you. You think that’s enough but no; eating lunch outside means fending your lunch. Then, when you are trying to sleep, they decide to sit on the cable wires outside of your window and coo all night long. In the morning, you wake up to their cooing to start another pigeon-filled day again.
As you have recollected, pigeons live very closely to humans whether you like it or not. This means they use our stuff too. It’s like that guest who does not know when they are no longer welcomed. They believe in the saying “Mi casa su casa” only it’s your house they are sharing. Pigeons choose high places like our rooftop or skyscrapers to make their nests. They live in tight crawlspaces that are safe from predators and start to reproduce. “Breeding occurs throughout the year, usually taking place between March and July.”
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Even though they share our space, they do not do their part in cleaning up after themselves. They leave debris everywhere they roam and their waste can be very corrosive. “‘Pigeon droppings contain ammonia and acids,’ said chemist Neal Langerman, an officer with the health and safety division of the American Chemical Society. ‘If the dung isn't washed away, it dries out and turns into a concentrated salt. When water gets in and combines with the salt and ammonia, it creates small electrochemical reactions that rust the steel underneath.’” (Martiga Lohn “Pigeon Dung Examined in Bridge Collapse” August 22, 2007 http://www.abcnews.go.com/Technology/wireStory?id=3511882)
Then again, are pigeons really that bad? We like to leave trash everywhere we go too and the pigeons clean it up for us. They don’t seem to complain. In fact, they enjoy picking up after us. They probably think you would feel the same way about picking up after them. Humans and pigeons have sort of had a co-evolution where pigeons adapted to our buildings and built a diet upon our scraps. Humans are the host, pigeons are the parasite.
Because of their unkempt habits and our displeasure in cleaning up after them, their guano has caused major problems on our buildings. There have been news reports on how the buildup caused building collapses and even linked as one of the factors causing the bridge collapse in
To avoid cleaning up after pigeons, there are traps or structures set up to discourage roosting. I hope historic buildings know this and take preventive measures or have insurance. Is there such a thing as insurance protection for your assets against pigeon destruction?