|Male in winter at New Jersey, USA|
|Female, Ottawa, Canada|
|Red-breasted merganser range Breeding Resident Non-breeding Passage|
Merganser serrator (Linnaeus, 1758)
The red-breasted merganser (Mergus serrator) is a diving duck, one of the sawbills. The genus name is a Latin word used by Pliny and other Roman authors to refer to an unspecified waterbird, and serrator is a sawyer from Latin serra, "saw".
The red-breasted merganser was one of the many bird species originally described by Linnaeus in the landmark 1758 10th edition of his Systema Naturae, where it was given the binomial name of Mergus serrator.
The adult red-breasted merganser is 51-62 cm (20-24 in) long with a 70-86 cm (28-34 in) wingspan. It has a spiky crest and long thin red bill with serrated edges. The male has a dark head with a green sheen, a white neck with a rusty breast, a black back, and white underparts. Adult females have a rusty head and a greyish body. The juvenile is like the female, but lacks the white collar and has a smaller white wing patch.
The call of the female is a rasping prrak prrak, while the male gives a feeble hiccup-and-sneeze display call.
Its breeding habitat is freshwater lakes and rivers across northern North America, Greenland, Europe, and Asia. It nests in sheltered locations on the ground near water. It is migratory and many northern breeders winter in coastal waters further south.
The fastest duck ever recorded was a red-breasted merganser that attained a top airspeed of 100 mph while being pursued by an airplane. This eclipsed the previous speed record held by a canvasback clocked at 72 mph.