I recently separated my 2 cornichX chicks from my egg layers b/c they were eating 24/7.. After I moved them I started taking their food out at night. I have one chick that is FAT.. She even hates to stand to eat, just sits by the bowl and stuffs her face. Well I noticed this morning that her belly feathers are "rubbed" off. I thought she was wet so I went to dry her belly off and its just skin, shes rubbed most of the feathers off in a dime size area.. Is this normal?? My other chick is not as hefty and her belly is all feathered..