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'
Read more: DailyMail.com