We lost 2 to foxes, and then moved the girls to an enclosure surrounded by electric fence netting. I spent a long time cutting a boundary trail on the 4 sides, and laying it with pegged down anti-weed garden plastic sheeting. The fencing sits on that, and has a zap that makes you curse. We then discovered that the hens were totally safe from foxes, and the hen food was also totally safe from rats and mice, but not from wild birds taking advantage of the feeders. Also, we found that birds of prey would try - and succeed in one case - to take a hen. We put in a large roofed section that covered quarter of the run, so they could be out of sight and reach, unless the B of P tries to follow them inside. We also got a cockerel - he is a fantastic guard for aerial predators, and more than paid back his presence when taking the flak from a goshawk - that I then had to remove from the coop. Luckily the hens ( and cockerel) all went up the ladder into the Egloo, and the commotion had me outside (waving a slipper and shouting ! - thinking it was a fox ! ) so I saw the issue, and could go into the run, close the door to the Egloo, and get the RSPCA to pick up the goshawk, who looked like he had done a few rounds with a rooster. Which he had. One hen, and the battered boy, needed vet treatment for wounds, but were fine, and soon grew feathers back, but was a timely reminder that predators are not just the fox type. I know they are still active in the area, as they are seen in the fields, and neighbours have lost lambs and hens to them. I ordered a printed sticker of a bird of prey in flight, as sen from above ( wings out etc ) and stuck that on the roof of the coop - any bird coming in from above will think there is already a B of P predator in the area. This works fine, as the hens can't see it, but anything flying over can.