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Why are duck eggs called duck eggs?

The difference between sea duck eggs and duck eggs is as follows: 1. Ducks that lay eggs are different: duck eggs are the eggs of domestic ducks and can hatch into ducklings. Sun-dried duck egg covers are eggs laid by ducks grazing on the beach and foraging for fish, shrimp, shellfish and algae. 2. Different distribution areas: Sea duck eggs are eggs produced by sea ducks cultured in coastal areas such as Zhanjiang, Fangchenggang, Beihai, Qinzhou, Weihai and Taishan in Guangdong. They are national mangrove reserves in Beize Bay, South China Sea. 3. Different nutrients: Duck eggs mainly contain protein, fat, calcium, phosphorus, iron, potassium, sodium, chlorine and other nutrients. Every 100g duck egg contains 4056mg lecithin and protein12.84g.. The total amount of 18 amino acids necessary for human body is as high as11.53g. It also contains beneficial trace elements such as calcium, phosphorus, iron, zinc, iodine, magnesium, potassium, selenium and 65433. 4. Suitable for different people: Duck eggs are sweet and cool in nature, have the function of nourishing yin and clearing away lung heat, and are suitable for patients with physical weakness, dry throat and sore throat after illness. Duck eggs have the functions of dredging blood vessels, enhancing memory and preventing Alzheimer's disease, and are suitable for all ages.