Harlequin Duck vs White-winged Scoter

In short

Harlequin Duck and White-winged Scoter can be distinguished by their plumage and behavior. The Harlequin Duck is known for its striking slate blue plumage with bold white, black, and chestnut markings, while the White-winged Scoter is darker with distinctive white wing patches. Harlequin Ducks are often found in turbulent waters, whereas White-winged Scoters prefer open coastal environments.

Identification tips

• Plumage: Look for the Harlequin Duck's slate blue with bold white, black, and chestnut markings. The White-winged Scoter is darker with a white wing patch.
• Behavior: Observe the Harlequin Duck's unique ability to navigate and feed in fast-flowing waters. White-winged Scoters dive for food and often fly in lines over water.
• Habitat: Note the habitat; Harlequin Ducks are in turbulent waters, while White-winged Scoters are in open coastal areas.

Size

White-winged Scoter is generally larger than the Harlequin Duck.

Plumage

Harlequin Duck males have a slate blue body with bold white, black, and chestnut markings, resembling a harlequin costume. In contrast, the White-winged Scoter is mostly dark with a noticeable white patch on the wings, visible in flight.

Behaviour

Harlequin Ducks are adept at swimming and feeding among boulders in fast-flowing rivers, and they are relatively tame. White-winged Scoters feed by diving and are often seen flying low over water in strings.

Habitat

Harlequin Ducks are found in fast-flowing rivers and coastal surf zones, while White-winged Scoters prefer open coastal environments, especially bays and inlets.

Voice

Harlequin Ducks produce a squeaky, unducklike sound, earning them the nickname 'sea mice.' White-winged Scoter vocalizations are not well-documented in the provided notes.