I am new to all this. We have a broody chicken, well 2 broody chickens but 4 eggs were under one. I went to check on them this morning and found a dead chick with half its feathers missing from its back and a very bloody looking featherless neck. What happened?! We are concerned for the others but don't even know what is going on. We have had mites in there and trying to deal with it. But I didn't see many on the chick. I've been checking in on the other eggs but haven't seen any hatch yet. Will they all definitely hatch today? It's exactly 21 days of incubation today. They were laid the day before. Help!