Birds of North Carolina:
their Distribution and Abundance
Red-breasted Merganser - Mergus serrator
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General Comments The Red-breasted Merganser is one of the state's most common wintering waterfowl species, it being easily found in coastal areas and often in large numbers. A handful linger all summer near and along the coast, and it has bred there conclusively once or twice. Unlike the other two mergansers, it favors brackish and salt water habitats, occurring in flocks of hundreds to thousands on sounds (especially Pamlico Sound), bays, and embayed rivers; some also winter on the ocean. However, smaller numbers also frequent fresh water impoundments, lakes, and ponds, usually for short periods of time, both inland and coastally. In fact, it typically outnumbers the similar Common Merganser on inland lakes in migration and as winter visitors.
Breeding Status Accidental Breeder
NC BRC List Definitive
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Coastal Plain Winter resident, and accidental breeding resident. Common to locally abundant in the Tidewater and north coastal zones; common to very common along the southern coast. Some of the continent's largest wintering concentrations (often the national CBC high count) occur on Pamlico Sound, where tens of thousands spend the winter season. On lakes, ponds, and impoundments, the species is mainly a short-term visitor, and it is mostly an uncommon migrant and winter visitor farther inland. Generally early Oct to late May, with many records all summer long. An immature with some down feathers was seen at Wrightsville Beach, 28 Jun 1967. Peak count: 150,000, Pamlico Sound, 9 Jan 1981.
Piedmont Transient and winter visitor. Rare to occasionally uncommon in fall and winter, and uncommon in spring migration, especially in Mar and early Apr. A flurry of dozens of birds was noted on lakes in the province in Feb 2014. Occurs mainly on larger reservoirs, but females may occur on ponds and smaller lakes. Mainly late Oct to early May. Peak counts: 149, Lake Townsend (Guilford), 10 Mar 2014; 100+, Lake Townsend, 25 Feb 2014; 100, Lake Wheeler (Wake), 30 Mar 1977; 75, Lake Crabtree (Wake), 12 Dec 2012.
Mountains Transient and winter visitor. Rare to occasionally uncommon in fall and winter, but more frequent (uncommon) in spring. Most records are from the lower elevations in the southern mountains (Buncombe, Henderson, and Transylvania). Mainly early Nov to early May. Peak counts -- all from 6 Dec 2016: 114, Lake Junaluska (Haywood); 100+, Lake Julian (Buncombe); 75, at a wastewater treatment plant along NC 191 (Henderson). Other high counts: 40+, Deerlake (Transylvania), 19 Mar 1997; 36, Lake Julian (Buncombe), 22 Nov 2014.
Finding Tips The species is practically impossible to miss in a day of birding around salt or brackish water in winter. Many thousands winter in the middle of Pamlico Sound and can be seen from the Swan Quarter ferry. It is often the most common duck on coastal CBC's; seldom does such a count miss this species. Inland, it is best to search large lakes in migration, such as in Nov and from late Mar to mid-Apr.
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Attribution LeGrand[2017-08-23], LeGrand[2015-06-13], LeGrand[2014-12-13]
NC Map
Map depicts all counties with a report (transient or resident) for the species.
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NA Maps
(source NatureServe)

View NatureServe distribution maps for Mergus serrator