I am a newbie vegetable gardener. I planted tomatoes, zucchini, peppers, lettuce and onions. I have the are fenced in and don't see any signes of something digging its way in, but something is eating my vidalia onions. The other morning, I found a small cluster pulled out of the dirt. I replanted them and this morning, they were pulled out again. Does anyone know what critter would do this?