Large dark waterbird feather; possibly a cormorant or similar species (not securely identifiable).

A long, dark feather with an asymmetrical vane and contrasting pale base is held against a wooden background. Its form suggests a flight feather, but the photograph does not show enough diagnostic pattern to identify the bird confidently.

Mostly uniform dark brown to black, with a pale cream-white basal section on one side. Lighting and the single visible surface limit color assessment.

The dark vane appears tightly pennaceous; pale barbs near the base are separated or damaged. Fine barbules are not resolved in the photograph.

A pale central shaft runs along the feather; dark barbs form most of the vane, while basal pale barbs appear sparse, broken, or naturally loose.

The vane looks smooth and matte, with a stiff-looking shaft; surface texture and waterproofing cannot be judged from the image.

Probably from a wing, based on its elongated, asymmetric shape; primary versus secondary is uncertain.

Strong dark-versus-pale contrast at the base, an asymmetric outline, and apparent basal vane damage or separation. These traits alone are not species-diagnostic.

Cannot be assigned without a reliable species identification. If from a cormorant, likely freshwater or coastal aquatic habitats.

The stated Tanzania location is compatible with several widespread African waterbirds, but does not identify the source species.

The source species and its ecological role cannot be determined confidently. If found in Tanzania, identification should be checked against local waterbirds and applicable wildlife protections.

Cormorants, darters, herons, and other large waterbirds can have dark flight feathers; distinguishing them generally requires clearer markings, measurements, and comparison with reference specimens.

Many aquatic birds have dark, melanin-rich flight feathers that resist abrasion, but this feather cannot be attributed to a species from the image.

Bird feathers have many cultural and historical uses, but species identification is essential; trade and possession of some wild-bird feathers are regulated. Check Tanzanian wildlife rules before collecting or keeping it.

Photograph both sides beside a ruler, including the tip and base, and record where it was found. Avoid relying on color alone; retain location notes and consult a regional feather guide or expert.

The basal barbs look frayed, separated, or possibly damaged; the distal vane appears largely intact. Overall condition: fair; age and molt status are unclear.

Tanzania