Talked to a farmer friend of mine and he invited my son and I to one of his farms wnere ne raises pigs to exterminate some rats. So around noon today we went to the barn where he said he was having the most problems and did manage to kill 1 and saw about 20 or so and the sign was incredible, tunnels everywhere. We had to leave for the afternoon and I told him I would return around dark. So at dark I returned and was dumbfounded when I only saw 3 rats of which I killed 2. So my ? is is his rat problem not that bad or do I need to go there later at night? I thought that as soon as the sun went down they came out? Your thoughts. Thanks Jamie