1. The mallard duck (scientific name: Anas platyrhynchos) is a swimming bird and a large duck.
 2. Its body length is 47-62 cm, and its weight is about 1 kg. Its shape and size are similar to those of domestic ducks.
 3. The male bird has a yellow green beak, orange yellow feet, green head and neck, and a clear white collar ring at the neck.
 4. The upper body is dark brown, the upper coverts on the waist and tail are black, and the two pairs of central tail feathers are also black, and curl upward into a hook shape; The outer tail feather is white.
 5. Chestnut.
 6. Wings, two flanks and abdomen are gray white, with purple blue wing mirrors. The upper and lower edges of the wing mirrors have wide white edges, which are very eye-catching when flying.
 7. The female duck has a dark brown beak, a dark brown yellow mouth, orange feet, and a purple blue wing mirror and a wide white edge at the front and rear edges of the wing mirror.
 8. It usually lives near freshwater lakes, and also groups in rivers, lakes, reservoirs, bays, coastal beaches, salt fields and other waters.
 9. There are webs between the toes of ducks, but they seldom dive. When swimming, their tails are out of the water. They are good at finding food, paddling and mating in the water.
 10. She likes to be clean. She often combs her feathers in water and on land and dresses up meticulously. She looks after each other when sleeping or resting.
 11. They mainly feed on plants and also eat invertebrates and crustaceans.
 12. It is distributed in temperate waters of Europe, Asia and North America.
 13. Overwintering in Europe, southern Asia, North Africa and Central America.
 14. On May 29, 2020, the Ministry of Agriculture and Rural Affairs released a new version of the Catalogue approved by the State Council, which for the first time defined 33 kinds of domestic livestock and poultry, including mallard ducks.