Steller's Eider vs Harlequin Duck

In short

Steller's Eider and Harlequin Duck can be distinguished by their plumage and behavior. Steller's Eider males have a distinctive black and white pattern with a greenish nape, while Harlequin Ducks are slate blue with bold white, black, and chestnut markings. Behaviorally, Harlequin Ducks are often found in fast-flowing rivers, whereas Steller's Eiders prefer shallow marine waters.

Identification tips

• Plumage: Look for the bold black and white pattern with a greenish nape on male Steller's Eiders, and the slate blue with chestnut markings on Harlequin Ducks.
• Behavior: Observe the habitat; Harlequin Ducks are often in fast-flowing rivers, while Steller's Eiders are in shallow marine waters.
• Vocalization: Listen for the squeaking sounds of Harlequin Ducks, which are unique among ducks.

Size

Both species are small sea ducks, but Steller's Eider is slightly smaller and more compact than the Harlequin Duck.

Plumage

Male Steller's Eider has a striking black and white pattern with a greenish nape, while the Harlequin Duck is slate blue with bold white, black, and chestnut markings. Female Steller's Eiders are brown with a white eye-ring, whereas female Harlequin Ducks are more uniformly brown with less distinct markings.

Behaviour

Harlequin Ducks are known for their ability to navigate and feed in fast-flowing rivers, often seen in raging surf or on rocks. Steller's Eiders, in contrast, are more likely to be found in shallow marine waters, often in large flocks.

Habitat

Steller's Eiders are typically found in shallow marine waters during non-breeding seasons, while Harlequin Ducks prefer rocky coastlines and fast-flowing rivers.

Voice

Harlequin Ducks produce a squeaking sound during interactions, unlike most ducks. Steller's Eider vocalizations are less distinctive and not noted for field identification.