Help! My garden is full of pigeons

Apologies for the poor quality of my picture today.  It was taken through the bedroom window.  Every time I tried to open a window or even if I made a move after leaving a window open for a while the little so and so’s scarpered.  The yellow stuff on the bird table is soggy cornflakes put out by Mark.  The pigeons seem to love it and are thriving.  

I had a burst of energy today then went back to bed.  Hopefully normal service will be resumed tomorrow