Welcome to BYC, & good luck with your hatch!
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Agreed. I wish I had taken more pics of mine during incubation for comparison. I did have 1 egg that I thought quite halfway through (about half the egg lost its veining) but the duckling continued to move so I let it. It did hatch on its own (albeit it has (neuro?) issues. If it’s moving (and you’re sure it’s not had build up) it’s fine to leave it longer. I will you luck.Good morning, and welcome to BYC. Development is not right for a 25 day egg. I'm not certain that it is viable.