How to Identify Steller's Eider Feathers

What Steller's Eider's Feathers Look Like

Steller's Eider is the smallest of the eider ducks and breeds in the high Arctic, and its feathers reflect a more delicate build than its bulkier relatives. Breeding male head feathers are mostly white, marked with a distinct black patch around the eye and a small black spot on the chin/throat, a cleaner and more sharply defined head pattern than other eiders. The back is glossy black, and the underparts — breast and belly — are a warm cinnamon-buff to rich chestnut-orange, with a small but distinctive black spot at the side of the breast/flank where the dark back color intrudes onto the pale underside.

A key wing feature in both sexes is the speculum: a patch of secondary feathers with a glossy blue-purple iridescent sheen, bordered by white bars, visible as a bright panel on the folded or spread wing. Females are far plainer, an overall warm mottled brown with fine dark barring throughout, but they retain the same glossy blue speculum bordered in white, making that wing patch a useful identifier across both sexes. Overall feather size is notably smaller and more compact than other eiders, reflecting the species' small-bodied build.

Step-by-Step: Is This Feather From a Steller's Eider?

• Check for a glossy blue-purple speculum bordered in white. This wing patch is present in both sexes and is one of the most reliable clues to this species.
• Look at head feathers for white ground with a black eye patch. A clean white head marked by a well-defined black patch around the eye supports a breeding male.
• Examine underparts for cinnamon-buff to chestnut coloring with a black flank spot. This combination, especially the small black spot intruding onto the pale breast side, is a useful diagnostic detail.
• Assess overall feather size. Notably small and compact feathers, smaller than Common or King Eider, fit this species.
• Consider mottled brown feathers for females. Warm brown barring throughout, paired with the telltale blue speculum, can indicate a female Steller's Eider.

Similar Species & How to Tell Them Apart

• Common Eider — much larger, with a more extensively black-and-white patterned body (males show black flanks/belly and a pale green nape patch) and a different, less blue speculum, lacking the compact size of Steller's Eider.
• King Eider — males show a large orange bill shield and blue-gray crown, a very different head pattern from Steller's clean white-and-black head, and a larger overall body size.
• Harlequin Duck — smaller diving duck with bold white crescents and spots on a slate-blue body, an entirely different color scheme lacking the cinnamon underparts and blue speculum of Steller's Eider.

Where & When You'll Find Them

Steller's Eiders breed on Arctic tundra in far northeastern Russia and small areas of northern and western Alaska, then winter along ice-free coastal waters of the Bering Sea and parts of the Baltic and Norwegian coasts. Feathers are most likely found near breeding tundra pools in early-to-mid summer, and along wintering coastal waters in late fall through winter, when the species gathers in tight flocks on sheltered bays, often molting flight feathers during a flightless period in late summer near key staging areas.