Is it illegal to sell duck eggs online?

Not illegal. It is not illegal to sell duck eggs online, but it requires a business license, so it is not illegal. Duck' segg (also known as duck, duck egg, Taiping, duck spring, green husk, etc. ) is the egg of a domestic duck, and the fertilized egg can hatch into a duckling. It mainly contains protein, fat, calcium, phosphorus, iron, potassium, sodium, chlorine and other nutrients.