The feral pigeon reproduces at an alarming rate, especially when it is well fed and can find shelter. It’s mess carries all sorts of diseases and is capable of destroying masonry through the acid found in the guano. Fouling of pavements, private residences, fire escapes, etc are common place. All measures taken throughout the world have failed to stop the increase in numbers of the feral pigeon.

Associated diseases are:
E-Coli, Salmonella, Psittacosis, Ornithosis and various carsogens.