I have pack rats and field mice in my camp surrounding area ,,I trapped 9 field mice that were in my friends westwoods tent trailer I used a rat trap cheese on the trigger ,,I also trapped two pack rats using the snap tap with cheese on the trap ,,peanut butter is to soft to put on the trigger they get the peanut butter off without springing the trigger the cheese is hard and the rodents have to pull at the cheese in order to eat it..