Probably a domestic fancy pigeon (Rock Pigeon; also feral pigeon)

The image shows a close-up of a black-and-white pigeon wing, likely from a domestic fancy bird. Rock Pigeons are stout, short-necked birds with varied plumage, rapid direct flight, and familiar cooing calls.

Predominantly black to deep blue-black, with several conspicuous white patches on the inner wing feathers and a white feathered area near the body. Pattern can occur in domestic pigeon plumage.

Closely interlocking pennaceous barbs form smooth flight surfaces; individual barbules are not resolved in the image.

Dark rachides blend into the vanes; feather overlap creates a layered fan, though shaft details are indistinct.

Smooth, compact, and slightly glossy flight-feather vanes; soft white body feathers contrast with the firm wing.

The feathers remain attached to a partly visible wing. Long outer feathers are primaries; the inner, shorter row comprises secondaries and coverts.

Black wing with elongated white patches, layered flight feathers, and a white body area strongly suggests a domestic pigeon color variety; this pattern is not unique to a breed.

Rock Pigeons occupy cliffs and rocky coasts as well as cities, farms, and other human-modified habitats; they nest on ledges and buildings.

Native populations occur across parts of Europe, North Africa, and western and central Asia; feral and domestic birds are widespread worldwide.

Rock Pigeons consume seeds and scraps and serve as prey for urban raptors such as Peregrine Falcons. Feral populations are widespread; local abundance and impacts vary.

Other domestic pigeons can show similar patterns, and some doves have dark wings, but the broad, layered wing and white patches fit a pigeon. Exact breed cannot be determined here.

Domestic pigeons descend from the Rock Pigeon and have been bred into hundreds of varieties. Their exceptional homing ability has made them important messengers historically.

Pigeons have long been kept for food, sport, messaging, and exhibition. Avoid collecting feathers from protected native birds; local rules vary.

Identify the bird as well as the feather: note body size, wing pattern, and nearby nesting or roosting sites. A loose feather alone may not support species-level certainty.

Feathers appear attached and largely intact; wear and overall condition cannot be fully assessed from the cropped image.