Fertile Duck Eggs

[MeganMichele99]

The darker duck egg is 13 days old and the lighter one is 20 days old. I know the lighter duck egg is not fertile but I am confused about the darker one. Does anyone know if it’s fertile?

 

[FarmerGirl101]

Welcome to BYC!! If you can see some veins then yes it is fertile. If not then I would throw the egg way as it might be a stink egg.

 

[chickens really]

Candle from the fat end of the egg..The one definitely isn't fertile.