The Mexican duck (Anas platyrhynchos diazi) and the mallard (Anas platyrhynchos) are two closely related species of dabbling ducks. Both species are found in North America, but the Mexican duck is found primarily in Mexico and the southwestern United States, while the mallard is more widespread.
The Mexican duck is a smaller duck than the mallard, with a shorter neck and a more compact body. The male Mexican duck has a distinctive chestnut-colored head and neck, with a white eye-ring and a black bill. The female Mexican duck is similar in appearance to the female mallard, but she has a more mottled brown plumage.
