Peanut butter is an attractive bait for rodents like this. It will be less effective in warmer weather though. I was trying to trap chipmunks last summer and could not figure out how the bait plate was licked clean without tripping the spring.
It turned out that ANTS were stealing the bait.
I improved my catch by adding a larger lump of bait in the morning. The ants weren't able to finish it before the chippies got active.
It doesn't happen often but sometimes they run across the trap and you get a leg-hold. You may have to go looking for the critter and your trap. If you don't find them before spring you may end up with a fragrance... You can drill a hole in the trap's base and run a 'leash' to a weight or post. That should keep them where you can find them. Bring a stick or pellet gun.
Good luck!
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