Goldeneye

What are the different species of goldeneye birds and how do they differ?

There are two species of goldeneye, which are small diving ducks in the family Anatidae known for the whistling sound produced by their wings.¹

• Common Goldeneye (Bucephala clangula): This species breeds across the Northern Hemisphere. The male features a dark green head and a round white patch in front of the eye.¹
• Barrow’s Goldeneye (Bucephala islandica): Primarily found in northwestern North America and Iceland, this species is distinguished by a purplish-black head. The male has a more crested head shape and a crescent-shaped white patch in front of the eye.¹²

Both species are approximately 46 cm (18 inches) long and share similar physical characteristics, including black backs with white markings, white sides and breasts, and a diet consisting of aquatic invertebrates. They are also known for nesting in tree cavities.¹

How do goldeneye birds reproduce and what is unique about their nesting behavior?

Goldeneye birds, which include the common goldeneye (Bucephala clangula) and Barrow’s goldeneye (B. islandica), are small diving ducks known for their distinct nesting habits. Unlike many other duck species that nest on the ground, goldeneyes are cavity nesters, meaning they utilize tree cavities to lay their eggs and raise their young.¹

While the provided search results confirm that these birds nest in tree cavities, they do not contain specific details regarding the reproductive cycle, incubation periods, or unique parental behaviors of the goldeneye species themselves. The information regarding nest sanitation, sealing of cavities, and specific parental feeding roles provided in the search results pertains to the order Coraciiformes (such as hornbills and bee-eaters) rather than the Anatidae family to which goldeneyes belong.¹³

What are the distinguishing physical characteristics of the goldeneye bird?

The goldeneye is a small, yellow-eyed diving duck belonging to the family Anatidae. Both the common goldeneye (Bucephala clangula) and Barrow’s goldeneye (B. islandica) measure approximately 46 cm (18 inches) in length and share a similar color palette, featuring black backs marked with white, along with white sides and breasts.¹

The two species are primarily distinguished by their head coloration and the shape of the white patch located in front of their eyes:

• Common Goldeneye: The male has a dark green head with a round white patch in front of the eye.¹
• Barrow’s Goldeneye: The male is characterized by a purplish-black head, a more crested head shape, and a crescent-shaped white patch in front of the eye.¹²

Additionally, the black wing markings differ significantly between the two species. While the American goldeneye is noted as a stocky, large-headed subspecies, the males are predominantly black and white, whereas females exhibit brown and gray plumage.¹⁴

Where are goldeneye birds typically found and what are their preferred habitats?

Goldeneye birds are widely distributed across the Northern Hemisphere, though their specific breeding ranges vary by species. The common goldeneye (Bucephala clangula) breeds throughout the Northern Hemisphere, while the major breeding grounds for Barrow’s goldeneye (B. islandica) are located in Iceland and northwestern North America.¹

Regarding their preferred habitats, these diving ducks are known for their resilience in cold climates. They often remain as far north as open water is available, moving further north as thawing occurs to reach their breeding grounds. During the winter months, both species primarily inhabit northern coastal waters. Because they are cavity nesters, their breeding habitat must include areas with suitable tree cavities, and they rely on a diet consisting of aquatic invertebrates.⁵¹