Lesser Scaup vs Steller's Eider

In short

Lesser Scaup and Steller's Eider can be distinguished by their structure and plumage. The Lesser Scaup has a more typical duck shape with a rounded head and a blue bill, while the Steller's Eider is more compact with a distinctive black and white pattern in males. Observing these features in the field can help differentiate the two species.

Identification tips

• Look for the rounded head and blue bill of the Lesser Scaup.
• Note the distinctive black and white pattern in male Steller's Eiders.
• Female Lesser Scaup have a white patch at the base of the bill; female Steller's Eiders do not.

Plumage

Male Lesser Scaup have a black head, chest, and rear with a grey body, while male Steller's Eiders have a striking black and white pattern with a chestnut breast. Female Lesser Scaup are brown with a white patch at the base of the bill, whereas female Steller's Eiders are more uniformly brown.