Hi, I have 4 hens, all 18 months. 2 Americaunas, 1 Buff Orpington, 1 Australorp. Their living situation is great, lots of room, no pests, plenty good quality food, water, THEY ARE LIVING THE GOOD LIFE. Last week 3 went nuts and started pecking the #!$@ out of the poor Australorp (Cora). She...