What I do to help keep predators and rats away is, I um, um, I um pee around the coop, I know it may sound crazy, but it works. If you pee down a rat hole, they wont use that hole any more and I believe it helps to keep the pussiom away and such. If or when I get a guinea hen sitting on eggs out in the brush, I go and pee all around her nest, havent lost a hen or eggs since I started doing that, so I believe it works. I hope I didnt offend anyone by stateing that, sorry if I did, didnt mean too....................