Rats over threw my coop.... They are ALL gone. I used the little round green rat bait stuff.. I pour it in the rat holes, I would leave a pile by the rat holes, but no where that the chickens could get to. Rats dont stay in the coop, they do go out, so find that "out"... Took me 2 bags of rat pellets to finally get almost 20 dead rats, big suckers. Plus, I made the PVC pipe feeders. Put cover on every night, and remove covers every morning. Before I could afford the PVC pipes method... I would pull their feed bucket up really high at night, and lower it every morning... I put a glass casserole dish under their bucket feeder to catch the feed they would throw on the ground, so no food for the rats. I used glass because when I tried a cat little tray, they would just tip it over.. So, no food, no rats.
Took me about half the summer to get new "no mess" feeders, and kill every single rat