I would like to keep chickens and not have rats, ever. Is it possible to only keep feed in the coop, never outside. Will this cause even more destruction of the lawn? Also, does anyone know of a rat proof coop design to stop them getting in to the food? I was thinking of having it raised 3 foot on stilts and having a dangling ledge (drawbridge style) about 2 foot above the ground, hoping that chickens could jump up, but rats could not.