Which came first, the chicken or the egg inside an egg?
In the video below, a man compares the regular size of the egg their hen usually lays to one that was almost double its size. According to the man’s narration, one of his hens laid the egg and even sympathized with it as it had to lay such a big one.
Before cracking the egg open, he joked that another egg might be inside. Imagine his surprise when another egg really was inside!
According to Backyard Poultry magazine, though quite rare, it is well-known that a hen will occasionally lay an egg inside of an egg. The cause of this phenomenon is called a counter-peristalsis contraction and occurs while the hen is in the process of forming an egg in her oviduct.