I have a small backyard flock, and dear hubby didn't build the coop rat proof. There are many gaps where they can get in. There is ivy on the shared fences around my yard. The rats love to hide in it. I have tried the 5 gallon buckets with bait. They won't touch it. My girls are molting, so I have added black sunflower seeds to supplement some extra protein. Now the rats are really making themselves known, with piles of empty shells throughout my coop. I am declaring war. I ordered some traps from amazon. I look forward to their arrival. I am also working on filling the gaps where the rats are getting in, but since my coop has the small 1" chicken wire, and not hardware cloth, I am sure they can still get in. My cat helps, but she is out numbered and getting very fat. She spends her nights out by the coop, and occasionally brings me a live sacrifice! Long story, I apologize. I will get to the question... what is your favorite method to controlling the rat population.