What are the names of the ducks with black and green heads?

White-headed duck with hard tail, 1996, is listed in the Red Book of Endangered Animals in the world and China, and is an endangered animal in the world. Its forehead, head, pillow, chin and throat are all white, mixed with fine lines of yellow skin; Dark brown on the head; The lower neck has a light black-brown ring, and the front neck becomes light reddish brown; The upper body skin is yellow with dark brown ripples. The tail feathers are yellowish brown and very hard. The lower body is milky yellow with dark brown horizontal spots. Only the lower cheek and chin of the female bird are white, and the rest of the head is dark brown. Live in the lake. Feeding on aquatic animals. The endangered animals in the world are extremely rare, and the present situation is unknown. Breeding records have been recorded in Junggar basin and Tianshan area in western Xinjiang. In recent years, sporadic individuals have appeared in Erdos, western Inner Mongolia, and wintered in Honghu Lake, Hubei Province.