Common Eider vs Stejneger's Scoter

In short

The bill shape and size are the most reliable field marks to differentiate between the Common Eider and Stejneger's Scoter. The Common Eider has a distinctive sloping profile with a long, wedge-shaped bill, while Stejneger's Scoter features a more rounded head with a shorter, thicker bill. These structural differences are crucial for identification, especially at a distance.

Identification tips

• Bill shape: Common Eider has a long, wedge-shaped bill; Stejneger's Scoter has a shorter, thicker bill.
• Head profile: Common Eider has a sloping head profile; Stejneger's Scoter has a more rounded head.
• Plumage: Male Common Eiders have distinctive black and white plumage; male Stejneger's Scoters are mostly black with a white eye patch.

Size

Common Eider is generally larger than Stejneger's Scoter.

Plumage

Both species have dark plumage, but the Common Eider males have a striking black and white pattern, whereas Stejneger's Scoter males are predominantly black with a white patch near the eye.