When the little yellow duck grows up, its beak is long, wide and flat, with 1 hard bean-like protrusions at the tip of its upper beak. The neck of the meat duck is thick and the neck of the egg duck is thin. The male duck is larger, with a wide back and shoulders. The female duck is smaller than the male duck, with a long neck and a thin neck.
The head, neck, upper and lower bodies of the Black Sea Muscovy Duck are all black, and the upper body is slightly shiny. The wings are covered with dark brown and silver gray feathers, and the tail is black and long and pointed. The top of the female bird's head and back neck are dark brown, and the head side, neck side, chin and throat are grayish white, with tiny light brown spots on the neck side, and the upper body is dark grayish brown with grayish white end spots, and the chest side and both sides are also grayish white end spots. The chest and abdomen are grayish brown, and the abdomen has a little less obvious grayish white markings.