Species authority page

Common merganser

Mergus merganser · Ducks · Waterfowl · Migratory game birds

Common merganser (Mergus merganser): Drake: mostly white body, black back and iridescent green head. Red bill, thick at the base and narrowing to the tip. This profile does not establish whether taking it is legal anywhere.

Certified rules currently represented in Hunt: coverage in development. This is coverage, not a legal answer.

Pair of common mergansers swimming
Photo by Šárka Krňávková on Unsplash
Scientific name
Mergus merganser
Family
Anatidae
Range
Breeds across Alaska and Canada and occurs through most of the continental US in suitable habitat.
Biology

How to identify it

Drake: mostly white body, black back and iridescent green head. [1]

Red bill, thick at the base and narrowing to the tip. [1]

Hen: gray body with a bright rusty head and a sharply defined white throat. [1]

Compared with the red-breasted merganser: Hens are similar; compare the common merganser hen's sharply defined white throat. [1]

Compared with the mallard: Other green-headed ducks such as the mallard have a different body pattern and shape. [1]

Species it is confused with

Check these before deciding what you are looking at. If you are not certain what it is, do not shoot.

Field notes

  • Identification Do not identify Common merganser from colour alone. Compare structure, size, range and the listed similar species before making a field decision.[1]
Field knowledge

Where it lives

Clear rivers and lakes in forested country in summer; lakes, large rivers and occasionally coastal bays in winter. Mainly fresh water. [1]

Field knowledge

How it behaves

Dives and swims underwater, kicking both feet together; hunts mostly by sight. [1]

Eats mainly fish, also mussels, shrimp and salamanders. [1]

Gives low rasping croaks. [1]

Migrates late in fall and early in spring; males winter farther north than females and young. [1]

Regulatory handoff

Where it is listed for legal take

These authorities list this species for legal take in their own regulations.

Where legal take is listed

Being listed is not an open season. Seasons, zones, licences, methods and limits decide whether this animal may be taken on a given day and place — check Hunt or the authority before you go. Listings read 2026-09-30.

Geospatial intelligence

Where it is found

Breeds across Alaska and Canada and occurs through most of the continental US in suitable habitat.

Biology

Sources

Every claim above is attributed to one of these published sources.

  1. National Audubon Society · reviewed 2026-09-30

    National Audubon Society