This morning a hawk killed and was eating my full grown khaki campbell duck. My yard is around 2 acres. The back and fence line are fairly heavily wooded. There are a few brush piles in the yard I leave for the chickens to play on and hide in. They also hang out quite a bit of the time under our cars and boat. The hawk had the duck about 10 feet away from a brush pile (where 2 of my chickens were hiding). Is there anything I can do to make sure it doesn't come back for another easy meal? They have a covered run I can lock them up for a few days, but I would rather not imprison them permanently. I have a rooster, and my turkey is usually fairly good about sounding out alarms. I understand I'm going to lose a few birds free ranging, I'd just like to make sure I am doing everything possible to keep that from happening.