The Merganser is a type of duck that is found in North America, Europe, and parts of Asia. The SMEW is a species of Merganser that is native to Eurasia. It is a small duck with a black head, white neck, and grayish-brown body. The SMEW is a diving duck that feeds on fish, crustaceans, and aquatic insects. It is a migratory species that breeds in northern Europe and winters in southern Europe and western Asia.