Well we have had chickens for years...a nice coop and run but let them roam the yard by day for years without any trouble. Despite the calm winter this year in a matter of two days hawks zeroed in and took out five chickens leaving only one huddled under the deck. I crawled in and finally got her back to safety. Today friends who have wanted chickens came over and we traded a spare coop and run for 5 new girls. Lesson learned and no more free ranging on this land. An awful lesson learned especially since I loved watching the girls run around the yard. I guess what I'm saying is be careful. They may go unnoticed for a long while but once they are discovered you need to act fast.