You could make a rat box. Just make a U shape with 2x4.s standing on end. Maybe a foot long and wide. Put a top on it with about a 6 inch overhang on the open area. Put the poison inside and put the open area against a fence. I put a cinderblock on top of mine so it won't move. Rats will crawl into the opening and eat the poison. chickens, dogs, birds will be safe from the poison. I also put a block of Just One Bite inside the lawn mower shed. By the end of winter, all poison is gone- as are the rats.I`ve never heard of anyone effectively dealing with a rat infestation problem using only traps. Rats can and will reproduce faster than you can trap and or shoot them. Poison is necessary because rats are very intelligent and will learn to avoid most traps. Good luck in your battle against the vermin.