I am new to this so forgive me if these are uninformed questions. I have a coop for my chickens, but the nest boxes on the floor level are sometimes inhabited by my Muscovy ducks. I now have four adjacent nests occupied by three hens and one Muscovy. Each bird has about 8 eggs. Some nests have mixed eggs (chicken and Muscovy). I check periodically to remove rotten eggs. I have moved a few eggs so hens have chicken eggs and duck has duck eggs, but they are still mixed. I have found one dead duckling and one dead chick in the shed in the past few days. They were either in a nest or on the coop floor outside. I also had one live healthy duckling snuggling with a Muscovy hen and I moved that duckling to a brooder indoors (with another duckling). I took the duckling to prevent the duck from abandoning the other eggs in her nest. When she hatches out more I will return it to her. To give a complete picture, I have other Muscovy nests outside the coop, three or four, and earlier this week one hen hatched 14 healthy ducklings that she is happily raising (great mom). I was also able to hatch two more of her eggs in an incubator. Why would my other neonates die? They appear physically normal. I did not do autopsies. Each hen has her own nest in the coop, so there should be no conflicts. Second question, it seems I also am seeing a lot of rotten Muscovy eggs in some nests. I might expect one or two, but in some nests half the eggs are rotten. Can a moist environment cause rot? Bacterial or other infection? But, I did just have one large clutch hatch and have 16 healthy duckling from that clutch. The successful hatch came from a nest in a plastic airline-style dog crate away from other birds? Any ideas? Thanks much.