So for about a month now 6 of my younger hens have taken to camping out at night. I have searched far and wide, and can't find where they go. They seem to be so well hidden, that not even predators can find them. I have to admit my property is pretty over grown, and I can't look under every bush. They are not much bothered that they can't get to the food in the pen, by doing this. I started feeding them after a week of this nonsense, because I was worried they weren't getting enough. This is not good, what do you suggest I do?