Placement of snap traps: (A) single trap with trigger next to wall; (B) the double set increases your success; (C) double set placed parallel to the wall with triggers to the outside.
Credit: Adapted from The Rat, Its Biology and Control, Howard, W. E., and R. E. Marsh. 1981. Oakland: Univ. Calif. Div. Agric. Sci. Leaflet 2896.
