Motmot

Spectacled Eider vs King Eider

Somateria fischeri versus Somateria spectabilis

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Spectacled Eider (Somateria fischeri) Spectacled Eider
King Eider (Somateria spectabilis) King Eider

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In short

The most reliable field mark between Spectacled Eider and King Eider is the head pattern in adult males: Spectacled Eider males show bold, round white eye-patches ('spectacles') on a yellow-green head, while King Eider males have a pale blue-grey head with a prominent orange-yellow knob at the bill base and no spectacles. Females of both species are brown, but Spectacled Eider females have pale 'goggles' around the eyes, whereas King Eider females show a buffy eye ring and downward stripe. Immature and eclipse males resemble females, so careful attention to head and bill pattern is crucial. Both are large, heavy sea ducks, but King Eider is bulkier and has a more ornate bill. In flight or at a distance, size and structure help, but close views of the head are usually needed for certain ID.

Identification tips

  1. Adult male head pattern is diagnostic: Spectacled Eider males have large, round white 'spectacles' on a yellow-green head; King Eider males have a pale blue-grey head with a prominent orange-yellow knob at the bill base and no spectacles. This is the single most reliable mark in good light.
  2. Bill structure in males: King Eider males have a large, bulbous orange-yellow knob at the bill base and a red bill with a white nail, separated from the face by a thin black line. Spectacled Eider males have a more uniform, sloping bill without a knob.
  3. Female head pattern: Spectacled Eider females show pale goggles around the eyes, which can be seen with reasonable views. King Eider females have a buffy eye ring that extends into a downward curving stripe behind the eye and a buffy spot at the bill base.
  4. Female body pattern: King Eider females have blackish chevrons on the upperparts and flanks, and fine black streaks on the neck and head. Spectacled Eider females are more uniformly rich brown.
  5. Juvenile and eclipse males: Both resemble females, so rely on head pattern: pale goggles (Spectacled) vs. buffy eye ring and stripe (King). Bill color and shape may help if visible.
  6. Size and bulk: King Eider is larger and heavier, but this is only obvious with direct comparison or in mixed flocks. Otherwise, size is not a safe field mark.
  7. Breast and back color in adult males: Spectacled Eider has a white back and black body; King Eider has a buff-tinged white breast and black body, but the back is not as strikingly white.
  8. Bill color in females: King Eider females have a black or grey bill; Spectacled Eider females have a more uniform bill color, but this is subtle and variable.
  9. Flight and wing pattern: No distinctive differences are noted for immatures or adults in these sources; both show typical eider wing shape and coloration.
  10. Habitat context: In Alaska, both can occur together, but King Eider is more widespread elsewhere. Range and habitat overlap, so do not rely on location alone.
  11. Vocalizations: Spectacled Eider males give a weak crooning, females a harsh croak; King Eider calls are not described here, so voice is not a reliable separator.
  12. Seasonal plumage: Both species' males molt into eclipse plumage resembling females in late summer; in this phase, head pattern (goggles vs. eye ring/stripe) remains the best clue.
  13. Tertial shape in males: King Eider males have some tertials that curve up to form 'spurs' along the back, but this is subtle and not always visible.
  14. Mixed flocks: If you see both species together, compare head pattern and bill structure directly for the best chance at a positive ID.
  15. Pitfalls: Distant or poorly lit views, or birds in eclipse or immature plumage, can be very challenging. Always try for a clear look at the head and bill, and use multiple marks for confirmation.

Size

King Eider is the heavier species, with an average adult mass of about 1617 g compared to Spectacled Eider's 1368 g. Both are large sea ducks, but King Eider is typically bulkier and can reach up to 70 cm in length, whereas Spectacled Eider tops out around 57 cm. This size difference is most apparent when the two are side by side, but can be subtle in the field, especially with lone birds or at a distance.

Plumage

In adult breeding males, Spectacled Eider is unmistakable with its black body, white back, and yellow-green head adorned with large, round white 'spectacles' around the eyes. King Eider males have a mostly black body, a buff-tinged white breast, and a multicolored head: pale blue-grey on the crown and nape, pale green on the cheek, and a striking orange-yellow knob at the bill base, but no spectacles. The bill is red with a white nail and separated from the face by a thin black line. Female Spectacled Eiders are rich brown with distinct pale goggles around the eyes, while female King Eiders are also brown but have blackish chevrons on the body, fine streaks on the head and neck, a buffy spot at the bill base, and a buffy eye ring that curves downward behind the eye. Juveniles and eclipse males in both species resemble females, so head pattern remains the best clue: pale goggles (Spectacled) vs. buffy eye ring and stripe (King). No distinctive upperwing or flight pattern differences are noted for immatures in these sources.

Behaviour

Both species are typical sea ducks, often seen floating in coastal waters or diving for food. There are no strong behavioral differences noted in the sources that would reliably separate them in the field. Both can form large flocks outside the breeding season and are generally wary. Flight style is similar: strong, direct, and low over the water.

Habitat

Both species breed in Arctic or subarctic coastal tundra and winter at sea, often in remote, ice-edge or offshore waters. Spectacled Eider breeds mainly on the coasts of Alaska and northeastern Siberia, while King Eider has a broader Arctic range including northeast Europe, North America, and Asia. In North America, King Eider is more widespread, but both may occur in similar habitats during migration and winter, especially in Alaska.

Voice

Spectacled Eider males give a weak crooning call, while females have a harsh croak. King Eider vocalizations are not detailed in these sources for field separation. Voice is not a primary field mark for distinguishing these two species.

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The most reliable field mark between Spectacled Eider and King Eider is the head pattern in adult males: Spectacled Eider males show bold, round white eye-patches ('spectacles') on a yellow-green head, while King Eider males have a pale blue-grey head with a prominent orange-yellow knob at the bill base and no spectacles. Females of both species are brown, but Spectacled Eider females have pale 'goggles' around the eyes, whereas King Eider females show a buffy eye ring and downward stripe. Immature and eclipse males resemble females, so careful attention to head and bill pattern is crucial. Both are large, heavy sea ducks, but King Eider is bulkier and has a more ornate bill. In flight or at a distance, size and structure help, but close views of the head are usually needed for certain ID.

  1. Adult male head pattern is diagnostic: Spectacled Eider males have large, round white 'spectacles' on a yellow-green head; King Eider males have a pale blue-grey head with a prominent orange-yellow knob at the bill base and no spectacles. This is the single most reliable mark in good light.
  2. Bill structure in males: King Eider males have a large, bulbous orange-yellow knob at the bill base and a red bill with a white nail, separated from the face by a thin black line. Spectacled Eider males have a more uniform, sloping bill without a knob.
  3. Female head pattern: Spectacled Eider females show pale goggles around the eyes, which can be seen with reasonable views. King Eider females have a buffy eye ring that extends into a downward curving stripe behind the eye and a buffy spot at the bill base.
  4. Female body pattern: King Eider females have blackish chevrons on the upperparts and flanks, and fine black streaks on the neck and head. Spectacled Eider females are more uniformly rich brown.
  5. Juvenile and eclipse males: Both resemble females, so rely on head pattern: pale goggles (Spectacled) vs. buffy eye ring and stripe (King). Bill color and shape may help if visible.
  6. Size and bulk: King Eider is larger and heavier, but this is only obvious with direct comparison or in mixed flocks. Otherwise, size is not a safe field mark.
  7. Breast and back color in adult males: Spectacled Eider has a white back and black body; King Eider has a buff-tinged white breast and black body, but the back is not as strikingly white.
  8. Bill color in females: King Eider females have a black or grey bill; Spectacled Eider females have a more uniform bill color, but this is subtle and variable.
  9. Flight and wing pattern: No distinctive differences are noted for immatures or adults in these sources; both show typical eider wing shape and coloration.
  10. Habitat context: In Alaska, both can occur together, but King Eider is more widespread elsewhere. Range and habitat overlap, so do not rely on location alone.
  11. Vocalizations: Spectacled Eider males give a weak crooning, females a harsh croak; King Eider calls are not described here, so voice is not a reliable separator.
  12. Seasonal plumage: Both species' males molt into eclipse plumage resembling females in late summer; in this phase, head pattern (goggles vs. eye ring/stripe) remains the best clue.
  13. Tertial shape in males: King Eider males have some tertials that curve up to form 'spurs' along the back, but this is subtle and not always visible.
  14. Mixed flocks: If you see both species together, compare head pattern and bill structure directly for the best chance at a positive ID.
  15. Pitfalls: Distant or poorly lit views, or birds in eclipse or immature plumage, can be very challenging. Always try for a clear look at the head and bill, and use multiple marks for confirmation.

King Eider is the heavier species, with an average adult mass of about 1617 g compared to Spectacled Eider's 1368 g. Both are large sea ducks, but King Eider is typically bulkier and can reach up to 70 cm in length, whereas Spectacled Eider tops out around 57 cm. This size difference is most apparent when the two are side by side, but can be subtle in the field, especially with lone birds or at a distance.

In adult breeding males, Spectacled Eider is unmistakable with its black body, white back, and yellow-green head adorned with large, round white 'spectacles' around the eyes. King Eider males have a mostly black body, a buff-tinged white breast, and a multicolored head: pale blue-grey on the crown and nape, pale green on the cheek, and a striking orange-yellow knob at the bill base, but no spectacles. The bill is red with a white nail and separated from the face by a thin black line. Female Spectacled Eiders are rich brown with distinct pale goggles around the eyes, while female King Eiders are also brown but have blackish chevrons on the body, fine streaks on the head and neck, a buffy spot at the bill base, and a buffy eye ring that curves downward behind the eye. Juveniles and eclipse males in both species resemble females, so head pattern remains the best clue: pale goggles (Spectacled) vs. buffy eye ring and stripe (King). No distinctive upperwing or flight pattern differences are noted for immatures in these sources.

Both species are typical sea ducks, often seen floating in coastal waters or diving for food. There are no strong behavioral differences noted in the sources that would reliably separate them in the field. Both can form large flocks outside the breeding season and are generally wary. Flight style is similar: strong, direct, and low over the water.

Both species breed in Arctic or subarctic coastal tundra and winter at sea, often in remote, ice-edge or offshore waters. Spectacled Eider breeds mainly on the coasts of Alaska and northeastern Siberia, while King Eider has a broader Arctic range including northeast Europe, North America, and Asia. In North America, King Eider is more widespread, but both may occur in similar habitats during migration and winter, especially in Alaska.

Spectacled Eider males give a weak crooning call, while females have a harsh croak. King Eider vocalizations are not detailed in these sources for field separation. Voice is not a primary field mark for distinguishing these two species.

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Spectacled Eider · King Eider · My Tricky Birds