Duck is the general name of waterfowl in the subfamily Duckinae, or real duck. Ducks are smaller, with short necks, and some genera have bigger mouths. Legs are behind your body (like swans), so you stumble. Most real ducks (including several birds mistakenly called geese because of their individual size and body shape) are different from swans and geese, and have the following characteristics: males molt twice a year, females lay more eggs in each nest, and the eggshells are smooth; The legs are covered with overlapping scales; The cry shows some gender differences. Three famous ducks in China: Gaoyou Duck, Beijing Duck and Shaoxing Duck.

All real ducks, except duck and sea duck, are sexually mature in the first year, and they are paired in the breeding season, unlike swans and geese, which are paired for life. According to the unique behavior of ducks, ducks can be divided into three categories: drilling ducks, diving ducks and perching ducks. The mallard duck is a typical duck and the ancestor of most domestic ducks. Habitat ducks, such as Moscow ducks, have long claws and are favorite arboreal ducks. There are the most kinds of diving ducks (including the ocean). The mallard flies from the south to the north to lay eggs in spring, and then flies to the south for winter in autumn. After they were domesticated by humans, they lost their frivolous migration. In order to get more duck eggs, they were not allowed to stop production and hatch. Over time, domestic ducks lose the ability to hatch eggs. Duck's eyes have a 360-degree field of vision, and you can see behind you without turning your head.

On June 2, 2006, People's Republic of China (PRC) and the Ministry of Agriculture announced No.662 that Beijing Duck, Ma Youxian Duck, Liancheng White Duck, Jianchang Duck, Jinding Duck, Shaoxing Duck, Putian Black Duck and Gaoyou Duck were identified as national protected varieties of livestock and poultry genetic resources.