I have four hens (well, pullets really) who are 20 weeks old. They are in a chicken tractor at night and free range from about 7 a.m. until dark, when they put themselves to bed, and I shut them in. In the last 7-10 days, three of the four have wandered off and spent an entire night outside the coop. One of them had accidentally (I assume) ended up in the neighborhood behind us (about 250' through the woods from our little farm) in a chain link fence with two dogs who were fortunately not interested in her at all. One wandered about 400' in the other direction and lived with my horses for a day and a half until we finally got her rounded up and moved back over here. Last night, a third was missing when I went to close up the chicken tractor. We looked for her as well we could in the dark, and she was out there this morning acting completely normal. (I didn't close up the tractor since she was gone last night, even when I checked at midnight.) Is this normal? I find it weird that they are wandering off one at a time. I think they are relatively safe out there, because our dogs keep the wild critters a reasonable distance from our property. With the first missing chicken, I totally panicked, but I'm getting calmer at this point.