Hi! So 17 days ago I took in a single, what we believe, mallard duck egg. My parents had been watching a mama duck and her eggs, they thought she had about 13 eggs. Within 3 days all but one had been eaten by an animal. We took the last one in as an attempt to save it from the same fate. The issue is I now have no idea what stage of development it's at! I've never hatched an egg before in general. Did a lot of research and built my own incubator,he seems to be developing wonderfully, but I have no idea when to start lockdown! Backstory, I got it 17 days ago, the next day (16 days ago) we believe we saw a heartbeat, it was hard to see and you really had to pay attention but you could see it. Now fast forward to now, it's gotten quite big and filling up the egg. I guessed it to be about 20 days but I honestly have no idea when it was first laid. I'm going to attach some photos of candling and the air sac development hoping someone can give me an experienced guess! I have two little girls who have been watching and I want to be able to get this little guy his best chance to hatch!
