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Goosander Mergus merganser - Adult Male. L 58-66cm. Large, elegant diving duck. Narrow mandibles have serrated edges. In flight, upper surface of male’s inner wing is white; in female white is restricted to trailing edge. Sexes are dissimilar in other regards. Adult male has bright red bill, green-glossed head (looks dark in poor light), mainly pink-flushed white body and black back. In eclipse, resembles adult female but retains white wing pattern. Adult female has reddish bill, orange-red head with shaggy crest, and greyish body palest on breast; chin is white. Juvenile resembles dull adult female. Voice Displaying male utters ringing calls. Status Fairly common freshwater species beside wooded upland rivers; nests in tree holes. Influx from mainland Europe boosts winter numbers; found on reservoirs, lochs and flooded gravel pits.