How to Identify Lesser Black-backed Gull Feathers

What Lesser Black-backed Gull Feathers Look Like

The Lesser Black-backed Gull sits in an intermediate position among large gulls — darker than a Herring Gull but not as black as a Great Black-backed Gull — and a couple of specific clues help place it correctly.

• Mantle/back feathers: Dark slate-gray to blackish-gray, distinctly darker than Herring Gull but typically a notch lighter than the truly black mantle of Great Black-backed Gull.
• Wingtip feathers: Black, with small white mirror spots near the tips in adults.
• Head feathers (winter adult): White with fine grayish-brown streaking, becoming clean white in breeding plumage.
• Underparts/tail feathers: White, unmarked in adults.
• Leg feathers/skin (context clue): Adults have yellow legs, a useful piece of corroborating information if you observed the bird alongside finding a feather, since this differs from the pink legs of both Herring and Great Black-backed Gulls.
• Size: A medium-large gull; primaries typically run 12-15 inches (30-38 cm).

Step-by-Step: Is This Feather From a Lesser Black-backed Gull?

1. Judge the mantle darkness carefully. Distinctly darker than a pale gray Herring Gull feather, but not quite as inky black as a Great Black-backed Gull feather, fits this species' intermediate tone.
2. Check the wingtip for small white mirror spots within the black tip, typical of adult large gulls including this species.
3. If you saw the bird itself, note leg color. Yellow legs support Lesser Black-backed Gull over the pink-legged Herring and Great Black-backed Gulls.
4. Consider head streaking (winter) vs. clean white (breeding) for a general sense of season.
5. Factor in location. Originally a European/West African species, now increasingly regular along the Atlantic coast of North America, especially in fall and winter, so a coastal find in either region is plausible.

Similar Species & How to Tell Them Apart

• Herring Gull: Distinctly paler gray mantle, a clear step lighter than Lesser Black-backed Gull, plus pink (not yellow) legs.
• Great Black-backed Gull: Much larger overall with a truly black (not just dark slate) mantle, and pink legs rather than yellow.
• Yellow-legged Gull: Similar yellow legs and moderately dark mantle, but this species' range is centered on the Mediterranean and adjacent regions; mantle tone can be very close, making range the more reliable separator where the two might overlap.
• Slaty-backed Gull: Darker gray mantle overlapping somewhat with Lesser Black-backed's tone, but occurs in the North Pacific rather than the Atlantic-focused range of Lesser Black-backed Gull.

Where & When You'll Find Them

Lesser Black-backed Gulls breed across northern and western Europe, with wintering and increasingly year-round populations along the Atlantic coasts of Europe, West Africa, and, in growing numbers, eastern North America. In North America, they're most reliably found in fall and winter along the Atlantic Coast, often mixed into large gull flocks at beaches, landfills, and harbors. Molt in adults typically occurs in later summer and fall, so fresher feathers are more likely then, while worn feathers accumulate through the winter months in mixed gull flocks.