The Livestock Conservancy
"Duck eggs, tasty and rich, are starting to gain attention from health-conscious consumers and foodies. Bakers love them for the lift their higher fat content gives to cakes and other baked goods.
Some people who are allergic to chicken eggs find they can eat duck eggs because they lack a protein found in chicken eggs.
Duck eggs are about the same size as a jumbo chicken egg but have more nutrients. Paleo dieters like the higher omega-3 fatty acids in duck eggs. They are also high in vitamin B-12, Schaeffer said."