Has anyone got experience of dealing with pigeons perching above balconies? We have been told that the only fairly effective control methods are poison and spikes. We are not allowed to use poison in this area due to hawks (we actually and one eating a pigeon on our roof recently) and because we wash windows with a bosun's chair and ropes run over the roof edge we have been told we cannot put 'pigeon spikes' along the roof edge. One basic question is: "is a Corporation responsible for wildlife outside the building - as long as they are not in/on the building due to poor maintenance or loose food or ???"