I think slight taste differences come from ducks free ranging. They eat greens and flowers, which really enriches their eggs. BTW down in California they grow Marygold for the flower pedals. The pedals get mixed into chicken feed at chicken batteries, so the eggs are better. It enriches the color of the yolks and strengthens the flavor. Anything to get the sales edge at the supermarket shelf. People prefer an egg rich in orange color over lighter yellow looking ones. Thought I might throw this in, when it comes for flavor and color. Same principle applies to duck eggs or free ranging chickens.
Katharina
Katharina