I have chickens;5 standards 4 bantams. I am getting pigeons and that's why I'm worried. We have hawks here, badly. The sky is open above our house but there are woods diagonal from our yard. Hawks appear out of NO where and dissapear just as fast. How can I keep my pigeons safe? What is a hawk deterant or will the chickens and pigeons be safe? They are ornamental rollers if that helps...