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hmmm maybe rats. they sure can get through small spots. they wreaked havoc on our tomatoes last year. if you can find "have a heart" traps, they catch the critters without killing them; you can relocate if you wish. we also got a trap that lets out an electric charge when they step into it. Not so nice, but no crushed skulls either. with that electric one just on near the bed, they seemed to stay away; i think they could sense the high freqency noise or something.
this year we had a rat's nest in our compost bin! no matter how we tried to block the hole they chewed through the plastic box, they still got in!
maybe you could put a cover on the top too and see if it still happens.