Our chickens and ducks are locked in a coop overnight, but free range exclusively during the day. We live on just over 7 acres, but the 2 acres immediately around the house is bordered on 2 sides by thick pine and cedar tree lines and then dotted with trees and cover between. This does two things...it provides a clear boundary for our free rangers and predators seem to skirt around it, opting for the open pastures to the north and east that aren't as frequented by our dogs and 5 busy kids to traverse our property. Our dogs are contained to this same free-ranging area with an underground fence and provide even more of a deterrent and are excellent chicken guardians. Have we lost birds to predators before? Of course...it is definitely the down side to free ranging, but in our circumstances, the benefits far outweigh the losses. There is nothing I love more than looking out a window and seeing my flock do their chicken things. I'm grateful that our setup is so accommodating.