Incubating duck eggs

[Emilily]

Hello I'm currently incubating some Cayuga eggs and I've come to candle them , it appears only two are fertile but one has two dark spots which are wiggling so alive but does this mean two embryos ? It's day ten of incubation as well . Hopefully someone can advise .

 

[Kiki]

Can you post pictures of the candled eggs?

 

[Rooster G]

Those dark spots are most likely eyes of the same embryo.