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What is a double yolk egg? How are they formed?

Eggs with double yolks are perfectly safe to eat, and double yolks are said to bring good luck when you find them. A double yolk occurs when a chicken releases two yolks into the same shell. Double yolks are usually produced by young chickens whose reproductive systems have not fully matured. Double yolks can also come from older chickens nearing the end of their egg producing period.