Video shows man cracking open a giant chicken egg only to find another inside

This is the surprising moment a family crack into an extra large egg and find another, shelled egg inside.  The rare occurrence is called a counter-peristalsis contraction and is caused when an oocyte - which becomes a yolk - is released too soon.  The YouTube uploader said: 'This gigantic egg had a yolk and another egg inside. I can't believe it didn't kill my hen'

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