who knows ? maybe they will mate with each other and your mystery eggs would be turnbutts. i am on day 18 and i see or hear nothing yet. my bantams have always hatched on day 18, the eggs are so tiny, hope they can make it out. i was trying to think of something to compare them to and all that comes to mind this early in the morn. is about half the size of a guinea egg. wish i knew how to work this camera.