We have 3 hens, mixed breeds, and a rooster that we've had since spring. Today we let them out of their pen to free range just like we do most days. And now there is no sign of the hens, the rooster has been crowing for them and looking for them all day. Usually they stay within about 100 feet of the house and spend most of their time in the flower bed right outside our front door. They come running whenever I call and have never gone more than about 100 yards from our house. Even on days where we have left them totally unsupervised they have always come back to the coop at dusk. It's dark now and there is no sign of them. Our house sits inside a 585 acre park, with 1000s of acres of forestry land all around.I hiked all around our house and there was no sign of them, no sign of a predator attack either. I'm very worried and I've got no idea what to do, any advice would be appreciated.