The North American common merganser or Eurasian goosander (Mergus merganser) is a large duck of rivers and lakes in forested areas of Europe, northern and central Asia, and North America. The genus name is Latin for an unspecified waterbird, and merganser is derived from mergus and anser, Latin for goose. It has serrated edges to its bill to help grip prey, so is often known as a sawbill. It tends to prefer freshwater wintering to saltwater, but may winter in coastal bays, estuaries, and harbours.
