I had a problem with those before. Not sure what they are called,( I think weebles???) but they love rice, sugar, flour, cereal....pretty much anything they can get in to. It seems they appear out of thin air. Go through all of your boxes in the cupboard (shake them good, they're tricky). Put your stuff in Tupperware ( or something air tight) and clean your cupboards out really good. If that doesn't work, you may have to call the exterminator. Hope it helps, good luck.
