These help too. Boarder Collie mix. He chills out with the ladies all day and barks at crows/black birds/vultures/squirrels.. Anything in a tree or flying over sounds off this "distraction" device.. Chickens & man's best friend.
I just deal with it. Whatever happens, happens. Raptors are protected by Federal laws that are strictly enforced.
I can always hatch more chickens. But only by staying out of prison. They will leave soon enough.