I have couple of nasty rats that are coming after my chicken feed. They can't get into the coop because I have left no room for them, however they have been attacking the feed stored in the garage. Back in October when it wasnt too cold, they were chewing through the feed bags which were put high on the tables. So I started storing my feed in plastic storage containers (plastic bins with strong snap lids). So they went after yes and believe it Oyster Shells which were store din bags thinking they were feed. Ok then I took away that as well. All of a sudden they left in November when it got cold but they are back with a vengeance after the last cold blast was over. This time they have overdone themselves, they have chewed and made a hole through the plastic bin and hence 50 lbs of feed has been spoiled. I am going to throw it away and get new one but don't know how to store it since they are eating plastic now as well. Is it safe to poison them in winter since they are not getting into the chicken coop and the chicken are not going to wander into the garage in winter? What are best traps available? I really really want to get rid of them but without making a mess.