I've only been raising chickens for about a year and a half, but my hens have started to run away more and more frequently. I have two Easter Eggers, two Rhode Island reds, and two Plymouth Rock hens. They are free range, and have always stayed close to their coop. Their coop is regularly cleaned, and they always have plenty of feed, grains, greens, minerals, and water. Their wings are all clipped on one side. They all get along fairly well (but the reds can be bullies sometimes). Nonetheless, they keep hopping the fence and keep going further and further away from my house, into my neighbor's yards and backyards. One of them has already been killed by a dog. Am I doing something wrong? What can I do to get them to stop?