Most duck eggs are larger than a chicken egg.
PoultryTalk's Response: Smell the egg, duck eggs have a scent chicken eggs dont. Also most are glossy and sometimes they are a greenish color. Also duck...
i would think, that you should rather break it into a dish if it smells it's old
if you break it and it has feathers it's old
and if ya break it and the colour is blackish it's old
and lastely if...