African Black Ducks (Anas Sparsa) are massive and heavy-appearing ducks, drakes are larger and paler than their mates. Blue-black or slate-gray bills distinguish South African Black Ducks (Anas Sparsa) from the other two races. Except for black nails and culmens, Abyssinian Black Duck bills are mainly fleshy-pink. They also show bluer speculums, as well as narrower and buffier barring and spots on the upperparts. The ducks dwell on mountain streams, rivers and lakes of the highlands up to 14,000 feet in west equatorial Africa and in East Africa south to Zimbabwe. The Gabon Black Ducks show chiefly blackish bills, and small diffuse pinkish areas at the base and near the tip, with a ventral spotting much smaller and buffier. African Black Ducks (Anas Sparsa) do a selective diet. They are not dependent on fast water, they seek for shady, swift-flowing, stony-bottomed rivers and streams featuring steep rapids, small waterfalls, and foliage overhanging the banks. They are too much sedentary and territorial pairs. African Black Ducks (Anas Sparsa) forage mostly among the boulders in the lee of flowing water, and also dive in the rapids and feed in swift-moving water standing on rocks, boulders and rivers edges as they probe under stones. Their strong pair bonds may exceed two years in duration, and highly territorial pairs ferociously defend 200-1,000 yards of wooded river territory throughout the year. Pairs of African Black Ducks (Anas Sparsa) are intolerant of intruding adults, though white-bellied juveniles are condoned. The hard carpal spurs of both sexes are used in fighting, when opponents are gasped by the back of the head and pummeled repeatedly, sometimes resulting in bleeding carpal joints. The African Black Ducks (Anas Sparsa) nests are placed among driftwood and other flood debris or thick, matted grass on banks.