One of our Rhode Island Reds is eating her eggs. This is distressing our other girls and they are trying to now hide their eggs from her and laying in strange places. We thought we had rats but this does not seem to be the case. We keep finding broken open eggs. Is this a dietary deficiency? These are free range hens who eat our vegetable scraps in addition to the bugs, etc. One hen is hopping over the fence to our neighbor's goat house to lay her eggs.