Bufflehead (Bucephala albeola)

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Image of a Bufflehead in its natural habitat
Birds Bufflehead

Introduction

The Bufflehead (Bucephala albeola) is a small North American diving duck in the family Anatidae. It breeds mainly in boreal forest and aspen parkland, then migrates to sheltered coastal and inland waters across much of the United States and parts of northern Mexico. It is recognised by its compact body, rounded head and, in adult males, a striking black-and-white plumage with an iridescent head.

Physical Description

The Bufflehead is one of North America’s smallest diving ducks. Adults are typically 32–40 cm long, with a wingspan of about 55 cm and a mass of approximately 270–513 g. Males are generally larger than females.

Adult males in breeding plumage have a dark head and back, white flanks and underparts, and a large white patch extending from behind the eye towards the back of the head. In good light, the dark head shows green and purple iridescence. The bill is blue-grey and the feet are pinkish.

Females and immature males are mostly grey-brown, with a white cheek patch and paler underparts. The cheek patch is usually smaller and less extensive than the white head patch of an adult male. Juveniles resemble females but may show less distinct facial markings and subtler contrasts in the plumage.

Range and Habitat

The Bufflehead is endemic to North America. Its main breeding range extends across Alaska and Canada, particularly through boreal forest and aspen parkland. Smaller, isolated breeding populations occur in parts of the western United States.

Breeding birds favour small, permanent freshwater ponds and lakes surrounded by woodland. They nest in tree cavities, especially old holes excavated by Northern Flickers, and their breeding distribution is closely associated with the availability of suitable cavities.

During migration and winter, Buffleheads occur across much of the United States and reach northern Mexico. They are especially common in sheltered coastal bays, estuaries, harbours and inlets, but also use inland ponds, lakes, reservoirs, slow-moving rivers and other wetlands. They generally avoid exposed coastlines and open water with heavy wave action.

Behaviour and Diet

Buffleheads are active divers. They often disappear abruptly beneath the surface while feeding, then reappear a short distance away. Dives commonly last around 12 seconds, although longer dives are possible. In groups, some birds may remain on the surface while others forage underwater.

Their diet varies with season and habitat. In freshwater, they feed mainly on aquatic insect larvae, including dragonfly, damselfly, midge, mayfly and caddisfly larvae, as well as water boatmen and other small invertebrates. They also take amphipods, snails and clams. In coastal waters, their prey includes shrimps, crabs, amphipods, isopods, mussels, snails and occasionally small fish or fish eggs. Seeds of pondweeds and bulrushes become more important during autumn and winter.

Buffleheads usually forage in shallow water over mud, sparse submerged vegetation or tidal flats. Most food is swallowed underwater. Newly hatched ducklings initially dabble at the surface, but they begin diving within their first few days.

Breeding pairs establish nesting territories near suitable water and cavities. The female lays her eggs in a tree cavity or nest box, usually lining the cavity with down. She incubates the clutch for about 28–33 days, while the male leaves during incubation to moult. Ducklings leave the cavity soon after hatching and are guided to water by the female. They remain dependent on her for several weeks before becoming independent.

Identification Tips

  • Look for a very small, compact diving duck with a rounded head and a short, narrow bill.
  • Adult males are sharply black and white, with a large white patch on the rear of the head and an iridescent green-and-purple sheen visible in good light.
  • Females and immature birds are grey-brown with a neat white cheek patch.
  • Buffleheads often dive repeatedly while feeding, making them easy to overlook on ponds and sheltered bays.
  • Common Goldeneyes and Barrow’s Goldeneyes are larger and have a white facial spot in front of or below the eye rather than the Bufflehead’s broad white patch behind the eye. Hooded Mergansers are also larger and have a fan-shaped crest and more extensive white patterning on the head and body.
  • In flight, adult males show broad white wing bars against otherwise dark wings.

Conservation Status

The Bufflehead is listed as Least Concern on the IUCN Red List. North American Breeding Bird Survey data indicate an increasing long-term population trend, although trends can vary among regions and monitoring methods.

Historically, heavy hunting pressure reduced Bufflehead numbers in the late nineteenth and early twentieth centuries. Regulations under the Migratory Birds Convention and managed hunting have supported population recovery. Current conservation concerns include the loss of mature trees and nesting cavities through forest clearance, the conversion of aspen parkland, degradation of wetlands and coastal habitats, pollution, and possible effects of climate change on breeding and wintering areas.

Conservation measures include protecting boreal forests, aspen parkland, wetlands and estuaries, maintaining mature cavity-bearing trees, managing hunting sustainably and installing appropriately sized nest boxes where natural cavities are scarce.

Frequently Asked Questions

Where does the Bufflehead live?

The Bufflehead breeds mainly in Alaska and Canada, in boreal forest and aspen parkland near freshwater ponds and lakes. It winters across much of the United States and in parts of northern Mexico, using sheltered coastal and inland waters.

Is the Bufflehead a sea duck?

Yes. It is a small sea duck in the genus Bucephala, although it also uses freshwater lakes, ponds and reservoirs during breeding, migration and winter.

What does the Bufflehead eat?

Its diet consists mainly of aquatic invertebrates such as insect larvae, crustaceans, snails and mussels. It also eats some plant seeds and occasionally small fish or fish eggs, depending on the season and habitat.

Where does the Bufflehead nest?

Buffleheads nest in tree cavities, particularly old Northern Flicker holes, usually near small lakes or ponds. They may also use nest boxes with suitably small entrances.

How can you identify a male Bufflehead?

An adult male has a compact black-and-white body, a dark iridescent head and a large white patch extending from behind the eye towards the back of the head. Its small size and repeated diving are also useful identification clues.

Is the Bufflehead endangered?

No. The species is currently classified as Least Concern globally. Nevertheless, protecting nesting cavities, wetlands, coastal habitats and migration sites remains important for maintaining healthy populations.

References

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