A
double yolker is an
egg (usually a
chicken egg) which has two
yolks. Triple yolkers are rarer but not unheard of. Since the yolk is the site of the
embryo in a fertilized egg, this occurrence is roughly analogous to
fraternal twins or triplets in a human pregnancy.
Double yolkers are usually large or extra-large size eggs, produced by young chickens whose egg-laying cycles are not fully synchronized. They can also result from a diet over-rich in nutrients, since a chicken who thinks times are good might try to create more offspring than usual. Then again, some chickens just seem to produce double yolkers their whole lives.
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