We own 10 laying hens and we are 100% sure there are no roosters. We found the smallest egg we have ever seen in the nesting box and it had brown speckles on it. It has been sitting in our egg basket for about 12 days and i just got around to cooking it today and when I went to crack it the shell was abnormally thick and was very difficult to crack. when i saw the egg in the pan it had a embryo with an umbilical chord and some partially formed organs and tissue. We aren't sure how it got there. Let me know if you have any idea!