Damned Pigeons again.

It is the war of the pigeons. The locals are trying to move in. My balcony has become the target. Each morning I get up each morning to the sound of nest building. There is a very nice niche on my balcony, perfect for a nest. I find sticks and feathers there each morning, and each morning I carefully remove them. These pigeons are persistent, they do not get the message.
I am a nature lover, I would never interfere with a nest normally and if I found a fully constructed nest I would not touch it. But, they are so damned noisy. They are very welcome to build a nest anywhere except where they can wake me at dawn. They usually wake me anyway, but if I let them nest there it is a guaranteed wake up call every morning. I just can let them take a foothold, I would never be able to get rid of them.
And they trample my flowers.