So far my best control method has been my cat. He goes into the run with me when I do final water change in the evening or when I chase everybody into the run after free ranging. He parks himself on their porch and waits. The last three nights when I've gone back out long after dark to chase the ducks into the coop and close the door he's had at least one dead rat or mouse. Lastnight he had a HUGE rat and two large mice/small rats. He got extra kitty yum yums when he came inside! His other favorite thing is to tell me when there's something under the hay box. He'll get himself oriented and I'll lift as high as I can while he dives in for the kill. We've done that 4 times for four dead rodents. His name has been changed from DK (Dumped Kat) to Rat Master. Honestly I can't say my baiting the rodents holes has made any difference, but he sure has.