Common Eider vs Harlequin Duck

In short

The Common Eider and Harlequin Duck are both sea ducks but differ significantly in appearance and behavior. The Common Eider is larger and more robust, while the Harlequin Duck is smaller and more colorful with distinctive patterns. Their habitats overlap in coastal areas, but their behaviors and vocalizations are quite distinct.

Identification tips

1. Look for size: Common Eiders are larger. 2. Check plumage: Harlequin Ducks have distinctive multicolored patterns. 3. Observe behavior: Harlequin Ducks are more agile in rough waters. 4. Listen for calls: Harlequin Ducks have a unique squeaky call. 5. Consider habitat: Harlequin Ducks favor rocky, turbulent areas.

Size

The Common Eider is larger and bulkier than the Harlequin Duck, which is more compact and agile.

Plumage

Common Eiders have a more uniform plumage with males showing black and white patterns, while Harlequin Ducks are slate blue with bold white, black, and chestnut markings, resembling a harlequin costume.

Behaviour

Common Eiders are often seen in flocks and are less agile in turbulent waters compared to Harlequin Ducks, which are adept at swimming and feeding among boulders in raging rivers.

Habitat

Both species can be found in coastal areas, but Harlequin Ducks are more often seen in rocky, turbulent waters, while Common Eiders prefer calmer coastal waters.

Voice

Harlequin Ducks produce a squeaky sound, earning them the nickname 'sea mice,' while Common Eiders have more typical duck vocalizations.