Steller's Eider vs Common Reed Warbler

In short

Steller's Eider and Common Reed Warbler are vastly different in appearance and habitat. Steller's Eider is a sea duck found in northern marine environments, while the Common Reed Warbler is a small passerine inhabiting reed beds. Their differences in size, plumage, and habitat make them easy to distinguish in the field.

Identification tips

• Size and shape: Look for the larger, bulkier shape of the eider compared to the small, slender warbler.
• Habitat: Note the environment; eiders are in marine or tundra areas, while reed warblers are in reed beds.
• Plumage: Observe the bold black and white of male Steller's Eiders versus the plain brown of the warbler.
• Behavior: Watch for diving behavior in eiders and reed-flitting in warblers.
• Vocalization: Listen for the warbler's song in suitable habitat.

Size

Steller's Eider is significantly larger, being a duck, while the Common Reed Warbler is a small songbird.

Plumage

Steller's Eider males have striking black and white plumage with a distinctive greenish sheen on the head, while females are mottled brown. Common Reed Warblers are uniformly brown with a paler underbelly and lack the bold patterns of the eider.

Behaviour

Steller's Eider is often seen diving or dabbling in water, whereas the Common Reed Warbler is more likely to be seen flitting among reeds and shrubs.

Habitat

Steller's Eider inhabits northern marine waters and tundra ponds, while the Common Reed Warbler is found in marshy habitats with reeds and sedges.

Voice

Common Reed Warbler is known for its distinctive, repetitive song, often heard in reed beds. Steller's Eider is generally silent, especially outside the breeding season.