When You See It You Will Be Amazed - Unusual Egg Found In A Farm. Typically, a hen releases an oocyte (the egg cell that becomes the yolk) from her left ovary every 16 to 26 hours, according to Backyard Poultry Magazine. The oocyte then travels through the oviduct, where layers of membranes and albumen are added along the way. However, if a second oocyte is released too early, the first oocyte (now in the hen’s uterus) gets sucked back inside by a contraction induced by the second egg. The counter-peristalsis contraction pushes it backwards to where it gets embedded inside egg number two. “To see that tiny egg inside a bigger is really rare,” said Gregoy Bedecarrats, an associate professor in animal and poultry science at the University of Guelph, to BuzzFeed. “I’ve never seen it personally, but it is possible.