How to Identify Red-legged Kittiwake Feathers

What Red-legged Kittiwake's Feathers Look Like

Red-legged Kittiwake is a small, cliff-nesting gull restricted to the Bering Sea region, and its feathers require a careful comparison with its far more widespread relative, Black-legged Kittiwake. Mantle and back feathers are a darker, richer gray than Black-legged Kittiwake's paler gray, a subtle but real difference best judged by comparing feathers side by side. Head and underparts feathers are clean white, and the head briefly grays in some non-breeding individuals.

The most useful diagnostic feathers come from the wingtip: Red-legged Kittiwake's outer primaries are solid black with no white spots or "string of pearls" markings — a genuinely important negative clue, since Black-legged Kittiwake shows small white spots interrupting the black wingtip pattern. Wings overall are relatively short compared to body size, reflecting a slightly different flight style, and the tail is white, only shallowly notched. Bill feathers are not present, but a short, stubby black bill fragment (if attached) further supports this species over the slightly longer-billed Black-legged Kittiwake.

Step-by-Step: Is This Feather From a Red-legged Kittiwake?

• Check the wingtip pattern for solid black with no white spots. The complete absence of white markings within the black wingtip is the single best distinguishing feature from Black-legged Kittiwake.
• Compare the mantle gray tone. A darker, richer gray back feather, judged against a known Black-legged Kittiwake sample if possible, supports this species.
• Assess wing feather proportions. Relatively short, compact flight feathers fit this species' build.
• Examine underparts. Clean white body feathers with no streaking are consistent, though shared with the similar Black-legged Kittiwake.
• Consider any attached bill fragment. A short, stubby black bill supports Red-legged Kittiwake over the slightly longer bill of Black-legged Kittiwake.

Similar Species & How to Tell Them Apart

• Black-legged Kittiwake — the essential comparison species: paler gray mantle, and critically, white spots ("string of pearls") within the black wingtip that Red-legged Kittiwake entirely lacks; also has black (not red) legs, though that's a soft-tissue trait.
• Ivory Gull — entirely white plumage with no gray mantle at all, easily separated by the complete absence of gray feathers.
• Sabine's Gull — shows a bold tricolor wing pattern (black, white, and gray triangular wing panels), quite different from the kittiwakes' simple gray-and-white with black wingtip arrangement.

Where & When You'll Find Them

Red-legged Kittiwake breeds almost exclusively on steep sea cliffs on a handful of Bering Sea islands, including the Pribilofs and a few other remote colonies, nesting in dense colonies alongside Black-legged Kittiwakes in some locations. Feathers are most commonly found directly beneath cliff colonies during the breeding season in summer, when both species may be present together, making careful wingtip pattern comparison especially useful in mixed colonies, and the species winters at sea in the northern Pacific, making feathers far less likely to be found away from these remote breeding cliffs outside the summer season.