Ok,first off,i like birds in my garden.But i do not like it when they sit on my newly erected fence and then leave poo runs all down my panels.Any humane ideas to keep them from perching on it?I have tried firing some staples into the woodwork at different hieghts along the top,but hasnt done much good.I dont have a cat,and i dont like brightly coloured windmills spinning around to deter them.Please help...cheers