johncarbaugh
Antisocial Prick!
There are these sheets of spikes you can buy that they sell for buildings and skyscrapers. They have little wire spikes that prevent them from landing. They are only expensive if there is a large area, but they do work. Google bird spikes and you'll see it.
I have seen them and there were full of nests. Daisy no bird no nest. Or a blow gun they are fun and would do the trick.