Probably just a lash egg, but it sure look convincingly like a chicken fetus. Probably over-active imagination, but certainly a lot of flesh to come out of a living chicken.
Similar strange thing happened. We have 14 hens that have never been exposed to a rooster or at least never layed a fertilized egg we have seen yet. But today we found what I thought looked like a fetus. I should of taken pictures before I opened it... but.. I didn't think it really was what it...