Rat traps work well, baited with block cheese coated with peanut butter. So far I am up to 11 kills. I like to stake down the trap. The rats run along walls giving them some cover, so I position my traps up against or close to the house. I had 4 holes chewed in my screen and I have no food source in the lanai. I used rat poison in the lanai, but do not use it outside for fear of killing animals other than rodents. I have also bagged two mice. Big traps do not work well for smaller rodents. I put out three traps at a time which will increase your kill rate.