Normally, smaller animals, such as birds, squirrels, etc., tend to scatter from human beings despite the location. Even at parks where the attraction is to feed the animals, they tend to flee unless physically trained otherwise. During my time in London I have come to realize that this is not the case.
Today as I was looking out the window I saw two pigeons enter an apartment upstairs. It looked as if they entered the kitchen, which I've found to be the place of choice. I estimated those birds where in there for approximately 10 minutes prior to leaving on their own freewill. I have first hand knowledge of what they left for some unsuspecting dwellers. Unfortunately, a colleague has experienced the wrath of pigeons and the presents they leave behind. The difference, however, is that my colleagues kitchen window was open approximately 5 inches, compared to the maximum allowed I witnessed today.
It's odd and sometimes scary to be living/visiting a city where small creatures embrace your presence, literally. Although this behavior may provide for ideal pictures, it is not always a comfortable experience.