I agree. We have a blueberry patch next to the coops. One day the birds were out and one was in the blueberries with me when a hawk came down and killed her not 10 feet away from me. It happened so fast I really didn't have time to react but it did fly off leaving my dead bird. I do have netting...
I had fishing line over my pens but an owl still got into one of the pens. Now I have netting covering all of the pens and have not lost a bird since to a raptor getting into a pen. Good luck...