Well, Here I thought we would elimiate the rats in our orchard & home . It turns out that we are only feeding them as they have developed some type of immunity to it as we went through 3/4 large can and never found a dead rat,& still hear them in the walls (we put them under the house also)and on a hanger around the base of the fruit trees. They take them away and eat them and keep coming back for more. What would you conclude from that? We then got rodent control from Walmart and bingo ! That started to kill them, but unfortunately in the walls and under the house and the smell was gagging for a while. I would get the "rodent Control" from walmart although it is more expensive it does the job. Sailor Don