Is there anyway to identify a duck egg from a chicken egg by sight only? I have a khaki Campbell duck and 9 chicken hens. My wynadottes (23 weeks old) have taken a liking to the duck hut and I've been finding eggs in there. My duck is 22 weeks old and could/has started to lay eggs. As soon as this horrible heat goes away, I'm going to build a separate pen for my ducks and will know for sure then if she lays an egg, but until then, the ducks and chickens share all.