Argh...Unfortunately, this behavior is contagious. I had to dispatch four of my White Rocks this winter for this very thing. Pretty easy to spot the culprits, too, as they literally had egg on their faces. Good luck
Do your hens have access to shell grit? I found when I supplied shell grit, the egg eating stopped. They're looking for calcium in most cases, but not all.
My kids blew out an egg and refilled it with sriracha hot sauce, then put our egg eater in a solo cage. She never ate another egg again, and lived to a happy old age.
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