You know, DragonFeathers, one of my daughter's friends said that her dad uses moth balls to repel snakes, too! I thought she was crazy, but now I'm wondering. . .
kmu, don't let the varmint hole thing keep you from getting/enjoying chickens. They are sooooo worth it, we just have to find a solution to our squirrel problem, that's all!
Our coop has been predator proof for a very long time. Among other things, we have cement down 6-8 inches all the way around our coop and run. It keeps things like dogs and raccoons out, but, as we recently discovered, doesn't deter the squirrels at all. We have 2 terriers that keep them away for the most part, but the one who has created this mess was lucky enough to avoid them. Luckily the snake got him, so maybe we will be ok for a while???