I incubated 3 mandarin duck eggs and 2 call duck eggs 31 days, 2 hours and 40 min ago. They have been trying to get out for 2 days has their shells continue to move when I speak to them through their incubator. I just candled them cause I needed to see what was going on. Eggs were shipped so all have saddle air sacks. Two of the eggs clearly have a ton of veins left. They are still trying to hatch internally, but those veins scare me. Any suggestions on these types of ducks? I will look up some research studies on these guys and hope I find more answers.