Large dark waterbird; likely a cormorant or goose, but not identifiable to common name from this image

A large, dark feather with a rounded tip, broad vanes, and a conspicuously pale, fluffy base. Its shape suggests a flight feather, but the photograph does not show enough diagnostic markings to identify the bird confidently.

Nearly uniform dark brown-black, with a pale gray-white basal area. Lighting and the feather’s underside may alter the apparent color; no species-diagnostic banding is evident.

Dark pennaceous vanes with interlocking barbs; loose, downy barbs are visible near the pale base. No clear aftershaft or specialized combing is visible.

A pale shaft at the base darkens along the vane and appears slender. Barbs are dark and closely arranged, becoming loose near the calamus.

Smooth, matte to faintly glossy vanes with a soft, downy base; some barbs appear separated or worn.

Probably from the wing, based on its elongated, broad form and apparent vane asymmetry; tail or body origin cannot be excluded.

Broad dark vane, rounded tip, pale basal down, and apparent asymmetry. These traits suggest a flight feather but are not distinctive enough for species identification.

Cannot be assigned without a reliable species identification; possible source groups include aquatic and coastal birds as well as other large birds.

Undetermined from the feather alone; many unrelated species have similarly dark flight feathers.

Cannot be specified without identifying the source species; feathers themselves provide insulation and waterproofing or aerodynamic surfaces, depending on their position.

Dark flight feathers of cormorants, geese, ducks, ravens, and other large birds can look similar. Pattern, measurements, shaft details, and a known collection location are needed to separate them.

Feather color and shape can vary substantially within one bird’s wing, so reliable identification often requires measurements, both sides, and comparison with reference specimens.

Feathers have long been used in art, fishing flies, and crafts. Laws protect many wild birds and restrict possession or trade of their feathers; identification and local regulations should be checked before keeping or using one.

Photograph both sides beside a ruler, note the exact length and widest point, and inspect the tip and shaft closely. Avoid collecting feathers where local wildlife laws prohibit possession.

Appears mostly intact, with loose or slightly frayed barbs near the base; no obvious breakage, staining, or strong bleaching is visible. Condition: Good, based on the photograph.