We seem to have developed a problem in my area with the formation of huge flocks of crows - several hundred birds at a time. I live on the top floor of the highest building and the birds seem to think that my balconies and roof exist for their perching pleasure.
I have thought of using one of these:
but I think that my neighbours and the police would not be too happy with me. What is the best way of dissuading the crows from using my building as a combined meeting place and toilet ?