This is a picture of the building where I predominantly work. You can see I have labelled certain parts of the building.
Over the last few years I have been here I have become aware that before I enter the building (through doors labelled A) I check the roof line (labelled B) for pigeons. This is because they poop over the edge of the building and I don’t want to get any of that on me. If I look at the floor underneath the eaves I can see a distribution of pigeon poop along the length of the building. If I spot pigeons directly above the doors I will adjust my approach to the building. In the picture the birds sitting quietly (labelled C) would not be considered a threat unless it was a windy day.
Don’t get me started on the seagulls on the other buildings!