Likely African Fish-Eagle (also African sea eagle); identification is tentative from a single feather.

A large, dark raptor feather, reported at 33 cm, with a pale shaft and extensive vane loss. The proposed species is a striking fish-eating eagle with chestnut body, white head and tail, and a black hooked bill.

The intact vane is nearly uniform dark brown to black, with a pale cream shaft and pale lower portion. African Fish-Eagles have dark flight feathers, but this feather lacks enough diagnostic markings for secure identification.

Pennaceous vanes with interlocking barbules; much of one vane appears missing or damaged. No fluffy down or distinctive owl-like fringe is visible.

The central rachis is pale and sturdy; dark barbs form a dense vane on one side, while the opposite side is largely stripped or broken.

Appears smooth and matte, with firm flight-feather vanes; condition prevents assessing the original surface fully.

Probably wing, based on length and asymmetry; primary versus secondary cannot be determined reliably.

Large size, dark vane, pale rachis, and Tanzania provenance fit a large African raptor, but are not species-diagnostic; damage may obscure useful patterning.

If from an African Fish-Eagle, likely source habitats include lakes, rivers, and wetlands, where it nests in large trees and hunts from perches.

African Fish-Eagles occur widely across sub-Saharan Africa, including Tanzania, mainly near substantial water bodies.

As a top predator, the African Fish-Eagle helps regulate fish and other aquatic prey populations. It is widespread, though local populations depend on healthy waters and nesting trees.

Other large African eagles, including Martial Eagle and Verreaux's Eagle, can have dark flight feathers. Feather pattern, precise measurements, and comparison with reference collections are needed to separate them.

African Fish-Eagles often call in conspicuous duets and plunge feet-first to seize fish, their principal prey.

Raptor feathers may be subject to wildlife-trade restrictions; do not sell or transport this specimen without confirming its legal origin and applicable permits.

Record exact length, both sides, shaft and vane condition, and photographs with a scale; compare against regional feather guides. Avoid collecting feathers from nests or protected species.

Poor: substantial vane loss or breakage is visible. No clear evidence of active growth, fault bars, or oil contamination can be assessed.

33 cm, Tanzania