without human intervention, as the chicks interfere with each other's hatching process and do not survive.

Higher-order yolks are rare, though hens are known to occasionally lay even triple-yolk eggs.

Yolkless eggs

Eggs without yolks are known as "dwarf" or "wind" eggs, or the archaic term "cock egg". Such an egg is most often a pullet's first effort, produced before her laying mechanism is fully ready. Mature hens rarely lay a yolkless egg, but sometimes a piece of reproductive tissue breaks away and passes down the

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