Early this summer, we started noticing signs of rats around the yard. About A week later we saw one. A few weeks later they were a common sight, and their holes were EVERYWHERE! We've tried so many things to try to get rid of them but nothing works (even with a hunter cat that kills up to 7 rats a week, and a HUGE owl living/hunting in our yard). This has gotten out of control. Any advice? Tips and tricks? Anything will help.