I haven't figured it out! I have seen all three in the box, but I am getting just one identical egg in the nest box every day. All three don't have really red faces yet, sometimes they blush, then they are watermelon pink again or even lighter a few minutes later. Wish I knew. I put a few under a silkie just in case they might be fertile/hatchable. Cross your fingers for me. I have three girls. Adele has four. When hers start to lay she was planning to bring them over. That should be GREAT! I'm so happy! I was getting worried when I was seeing other people's eggs look kinda "not so dark" even from well known breeder's stock. At least I have a sound start. Best eggs I ever bought!