Our worst predators in the past have been hawks. When i first started out it took me a little while to figure out what was taking my birds. I kept focusing on my ground attack for predators. Until that one day the hawk slipped up and let me see him. Needless to say no more chicken buffet for him. Now we keep netting over our pens.The use of netting also gives a good sence of security for keeping those couple chickens that always get out in. lol
Killing a bird of prey is against Federal law, fyi. There are other ways to discourage hawks.