My friend has chickens. All of them are able to jump over the fence, but choose not to except for 3! These 3 r some of my favorites and I would die if anything happened to them! They had a rooster that traveled with them, but he was killed. I don't want that to happen to them. No matter how much my friend try's to re arrange the pen, they always manage to hop out! They aren't a year old yet and she's only had them for to months. What can we do to stop the wandering?!