The shell of an egg usually contains an yolk and egg white, but sometimes you may come across an egg with 2 yolks in its shell. Such an egg, which has 2 yolks, is a rare phenomenon.
The probability of getting an egg with 2 yolk is 1 in every 1000 eggs. It's like winning a lottery.
There are many beliefs around the world about this type of egg - good and bad. In Norwegian mythology, an egg with 2 yolks is considered a bad omen and means, that someone in the family will die.
Others believe that an egg with 2 yolks in its shell predicts pregnancy in the family. Others think, that if you crack an egg and find 2 yolks in it, it will bring you luck.
But don't worry. These eggs are completely safe to eat. The yolks in them, as in ordinary eggs, are rich in nutrients such as vitamins, minerals, lipids and proteins.
The yolk, as part of the egg, is rich in iron, phosphorus, potassium and magnesium. As for vitamins, you will find the following: vitamin A, E, D, B9 (folic acid), B12, B6, B2 and B1.
Why does it happen for an egg to have 2 yolks?
Usually eggs with 2 yolks are laid by young hens, which are still learning how to lay. Their reproductive system has not fully matured and they periodically lay eggs with 2 yolks, instead of 1.