Hi I had a strange thing happen to me this morning. I was hatching duck eggs and they were pipping. Yesterday I was making sure all had air holes so they could breath. Yesterday would have been 4 weeks. We have 6 eggs that were hatching. I was checking on them this morning one was not moving. I opened him up more hoping that it was ok. I saw know movement so I decided to open the egg up to see how much yoke was left. I thought this would help to know if I needed to help the other ducklings. To my amazement there were not one but two ducklings in the egg. :/This was a normal size duck egg and they were sharing the same yoke. The twins were fully developed and normal. Has any one ever heard of this? I have been hatching eggs for years and never seen it myself. Here are the pictures.