Can large populations of pigeons do damage to the structures where they roost?
Yes. Even small populations of pigeons can cause a great deal of damage, both structural and aesthetic. The acidic nature of their droppings cause building materials to deteriorate, and damages exterior finishes. Marble and other masonry may be permanently stained, and the appearance of droppings on exterior walls, windows and floors is unsightly and requires much time and money to remove on a regular basis. Pigeon droppings on an unsuspecting pedestrian is never good, particularly when that pedestrian is a potential customer entering your place of business.
