I’m new to hatching , so I’m hoping you guys will have much more experience than I. Now I know hatching twins is very rare, but I have a number of eggs incubating at the moment, we are at day 10 and Iv watched them develop so far , and it’s been great. But then I saw something that confused me, so I’ve googled and sent so many messages and have asked all over my Facebook groups, it looks like I have an egg with twins /two embryos, so I was checking the other eggs, and it’s the same in 4 of them ! I know it’s so rare, but these eggs have all came from the same duck, so maybe she is just laying double yolks ? So I’m posting some pics here , you can see the two sides and in each side has a darker area and the veins are visible. please let me know your thoughts ! Thankyou in advance !