The relations of this species among the waterfowl is unresolved. It is morphologically close to shelducks, and particularly the South American sheldgeese, which have highly similar courtship displays.[2] However, mitochondrial DNAsequence analyses of the cytochrome b and NADH dehydrogenasesubunit2genes indicates that it might belong to a very distinct and ancient "duck" clade, together with Hartlaub's duck, another African species of uncertain affinities.[3] The wing color pattern, a good morphological indicator of evolutionary relationships in waterfowl, is similar in these two species, and very different from any other waterfowl.[3][4]
This is a stocky grey-brown bird about 70 centimetres (28 in) long with a slightly paler head and upper neck. It has a small black bill and black legs. A chunky mid-sized goose. Standing bird looks fairly dull, gray and dirty white, sometimes showing blue along the edge of the wing.[5] In flight, this species shows a pale blue forewing. Sexes are similar, but immature birds are duller. The plumage of these birds is thick and loose, furlike as an adaptation to the cold of the Ethiopian highlands.[2]
It feeds by grazing, and is apparently largely nocturnal, loafing during the day. It can swim and fly well, but this terrestrial bird is reluctant to do either, and is quite approachable. It forms flocks outside the breeding season.
It breeds by mountain lakes and streams. This little-known species is believed to build a lined nest amongst grass tussocks, and to lay 6–7 eggs.
^Madge, Steve; Burn, Hilary (1987). Wildfowl: an Identification Guide to the Ducks, Geese and Swans of the World. London: Christopher Helm. ISBN0-7470-2201-1.
