Steller's Eider vs Spectacled Eider

In short

Steller's Eider and Spectacled Eider are both sea ducks found in northern latitudes, but they can be distinguished by their distinct facial patterns and habitat preferences. Steller's Eider has a more compact body and a unique white head with a black eye patch, while Spectacled Eider features a distinctive 'spectacled' appearance with white eye rings.

Identification tips

• Facial pattern: Look for the distinct black eye patch on Steller's Eider and the 'spectacled' white eye rings on Spectacled Eider.
• Size and shape: Note the more compact body of Steller's Eider compared to the larger Spectacled Eider.
• Habitat: Consider the habitat; Steller's Eider is often found in shallow marine waters, while Spectacled Eider is more coastal.
• Seasonal aggregations: Large groups of Steller's Eider can be a clue during nonbreeding seasons.

Size

Steller's Eider is slightly smaller and more compact than the Spectacled Eider.

Plumage

Steller's Eider males have a striking white head with a black eye patch and a chestnut breast, whereas Spectacled Eider males have a greenish head with large, white eye rings giving a 'spectacled' look. Females of both species are more cryptically colored but can be differentiated by the presence of the eye rings in Spectacled Eiders.

Behaviour

Both species exhibit similar behaviors typical of sea ducks, such as diving for food. However, Steller's Eiders are more likely to form large aggregations during nonbreeding seasons.

Habitat

Steller's Eider nests near freshwater tundra ponds and winters in shallow marine waters, while Spectacled Eider prefers coastal marine environments year-round.