I had NEVER in my 23 years of farm life had an issue with rodents(kept mouse snap traps 24/7) and this spring developed some rats. was recommended to drown,poison,shoot(?) them and the drowning/poisoning seems cruel and lazy and shooting near impossible(and extremely time consuming) so I opted for rat snap traps(Victor brand ONLY) and in 7 wks. time have caught 6 young, 1 adult female,1 adult male(today) and will keep the snap traps going until I am sure its pretty much controlled. the first 2 snaps I had to finish the job but fortunately am usually there so I did it quick. subsequent trappings I repositioned the trap, etc and it appears to be very clean kill. I place the trap with bait side facing hole and cover the whole shebang with a milk crate(so rat approaches trap from bait side(with peanut butter) weighed down with a heavy block to keep other critters from getting hurt) am very proud of me and have proved snap traps DO WORK. still keep mouse traps set 24/7 and RARELY snap one.