We've just started with chickens this April, and have a small pullet flock of four. They are let out each morning to roam around the property. We're rural, surrounded by farmland, but have about an acre and a half ourselves, completely treed (not fenced). So far there haven't been any issues with predators that we know of. Today, only three girls were hanging around the yard at supper time. DH went for a walk around the perimeter (sometimes they hide under the trees) but couldn't find the last one. By 9pm, still only three were around, and they were put back into the coop. I just checked outside now (11pm) and still no chicken has returned. What kind of predator would be out and about during the day, and strike while we're home, kids in the yard, etc.? Our neighbours do have dogs which sometimes get loose, but none were around today. Still hoping she returns safely later tonight or tomorrow. Sigh ... that's our first one gone if we never see her again.