Common Merganser

Mergus merganser

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About This Species

The Common Merganser is a large, sleek diving duck often seen on rivers, lakes, and reservoirs, especially in colder months. Males are striking, with a dark green head, bright white body, and sharp contrast throughout, while females show a warm cinnamon-colored head with a shaggy crest and gray body. Built for fishing, mergansers are powerful swimmers that move confidently through clear water in search of prey.

Fun Facts

  • Fish specialists: Common Mergansers eat mostly fish, using their narrow, serrated bills to grip slippery prey.
  • Built for speed: Their streamlined bodies and strong legs make them excellent underwater hunters.
  • Cold-water lovers: They are often found on icy rivers and lakes when many other ducks have moved on.
  • Tree nesters: Females nest in tree cavities, sometimes far from water, and lead ducklings to water shortly after hatching.
  • Social feeders: They frequently fish in small groups, herding fish into shallow areas.
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