Hooded Merganser

Identification

The hooded merganser is a striking and compact diving duck, measuring 15.8–19.3 inches in length with a wingspan of 23.6–26.0 inches, making it the second-smallest merganser species. Both sexes possess distinctive crests that can be raised or lowered, giving the bird its common name. The species displays pronounced sexual dimorphism, particularly during breeding season.

Males in breeding plumage are dramatically patterned: the head, neck, dorsal areas, and breast are mainly black, with conspicuous large white patches on either side of the crest that become especially prominent when raised during courtship displays. The lower flanks are rich reddish-brown or chestnut, contrasting with white undersides and white stripes across the crop and breast. Females and non-breeding males are greyish-brown overall with a light reddish-brown crest and a narrow white patch over the lower breast and belly. A useful field mark in both sexes is narrow white stripes along the tertial wing feathers. Eye color provides another distinction: females have brown eyes, while males have yellow eyes except during their first winter.

Range & Habitat

The hooded merganser is restricted to North America and is the only merganser species native exclusively to this continent. These short-distance migrants maintain two major year-round ranges: one extending from the southern Canada–US border along the Atlantic Coast to the Gulf Coast near the Mississippi delta, and a smaller range from Washington state and southern British Columbia to northern Idaho. They also breed in regions from Missouri to southern Canada and from Nova Scotia to eastern North Dakota and Saskatchewan, migrating as necessary to avoid winter ice.

Hooded mergansers prefer small bodies of water such as ponds and small estuaries with ample emergent aquatic vegetation, though they also inhabit larger wetlands, impoundments, flooded timber, and rivers. While they favor freshwater environments, they occasionally occur on brackish water bodies. Notably, from 1966 to 2015, populations throughout the breeding range experienced consistent growth, increasing by more than 1.5% annually.

Behaviour & Diet

As diving predators, hooded mergansers hunt primarily by sight beneath the water's surface. Their diet is opportunistic and varies by location and season, but fish typically dominate their meals, comprising 44–81% of their intake. Aquatic insects constitute 13–20% of their diet, while other aquatic invertebrates such as crabs and crayfish account for 22–50%.

These ducks form monogamous pairs during breeding season, with partners remaining together until the female has selected a nesting cavity and completed laying her clutch. Males then depart, leaving females to incubate eggs and rear broods alone. Females actively seek cavities in dead trees or artificial nest boxes—similar to those provided for wood ducks—preferring cavities positioned 4–15 feet off the ground. Breeding occurs between late February and late June, with timing varying geographically.

Best Time & Places to See It

Winter offers excellent opportunities to observe hooded mergansers throughout their established ranges in the eastern United States and the Pacific Northwest, where they concentrate on ice-free ponds, lakes, and rivers. The Atlantic Coast from southern Canada to the Gulf Coast provides reliable winter viewing, while the Pacific range extends from Washington and British Columbia southward. Spring and early summer are ideal for observing breeding birds and witnessing dramatic male courtship displays with their crests raised.

Small freshwater ponds and estuaries with surrounding vegetation are prime habitat to search. Look for them on quiet water bodies rather than large open lakes. The birds' preference for specific microhabitats means that not all suitable-looking water will host mergansers, but consistent searching in the correct regions and seasons will reward patient observers.

Photography Tips

The hooded merganser's striking plumage and dynamic behavior make it an excellent photographic subject. Males in breeding plumage offer the most dramatic opportunities—position yourself to capture the iconic white crest patches when raised during courtship displays. The contrast between black and white markings on males provides excellent tonal range and visual impact. Early morning light, when birds are most active, works best for capturing behavioral shots.

Because these ducks favor small, vegetated water bodies rather than large open waters, photographers can often approach closer than with larger dabbling ducks. However, remain patient and still, as sudden movements will cause them to dive or take flight. Capture both the distinctive profile of the raised crest and the sleeker outline with crest lowered to show the species' remarkable range of forms. The white tertial stripes visible when birds are at rest provide subtle but distinctive field marks worth including in documentation photographs.