What is the difference between a fertile and non fertile duck eggs?

Answer by  seven (77)

I am not veterinarian, but i am assuming that a fertile egg is capable of sustaining a duckling, while unfertile ones cannot.

Answer by  TheAnswerFairy (2345)

The only difference is whether sperm was introduced into the egg during development. There is no difference by just looking, but you can candle them to check for fertility.