We call them rail way ties. Now I get ya. lol you know your area and what you want to do to keep them safe. Keep us updated. Seen any life in the egg yet?Im in a built up area never seen any predetors in the two years ive had hens here, now im fenced in, lights, camera, and gun at the ready. Id be quit happy to have them free, the water would be the only way into the coop making night attack nore difficult. A railway sleeper is a large piece of timber, 9inch by 4 inch by 5ft i have a few spare.