Again I'll ask what are you feeding them? They are probably craving more protein in their diet. I would switch to some higher, an all flock or non medicated grower, 18-20%. Also try not to feed too many extra stuff which cuts down the protein in a ration. I would also add some fake eggs, sometimes pecking them and not breaking them can deter future pecking. Always provide a bowl of oyster shells on the side free choice.
Chickens, muscovy ducks, turkeys, donkeys , goats, dogs, fish, parakeets, a parrot, and a cat.