Blue-winged Goose
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| Cyanochen cyanopterus (Rüppell, 1845) |
The Blue-winged Goose (Cyanochen cyanopterus) is a large goose, which is endemic to Ethiopia. It is the only member of the genus Cyanochen. Placement of this species in the waterfowl phylogeny is unresolved; while it is morphologically closest to shelducks[citation needed], mtDNA sequence analyses of the cytochrome b and NADH dehydrogenase subunit 2 genes (Johnson & Sorenson, 1999) indicates that it might belong to a very distinct and ancient "duck" clade, perhaps together with Hartlaub's Duck. Interestingly, the wing color pattern (which is the best morphological indicator of evolutionary relationships in waterfowl) is nearly identical in these two species, and very different from any other anatid (Madge & Burn, 1987).
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. 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.
The Blue-winged Goose is a stocky 60-75 cm grey-brown bird with a slightly paler head and upper neck. It has a small black bill and black legs. In flight, this species shows a pale blue forewing. Sexes are similar, but immature birds are duller.
This is a quiet species, but both sexes may give a soft whistle. It feeds by grazing, and is apparently largely nocturnal, loafing during the day.
[edit] References
- Johnson, Kevin P. & Sorenson, Michael D. (1999): Phylogeny and biogeography of dabbling ducks (genus Anas): a comparison of molecular and morphological evidence. Auk 116(3): 792–805. PDF fulltext
- Madge, Steve & Burn, Hilary (1987): Wildfowl : an identification guide to the ducks, geese and swans of the world. Christopher Helm, London. ISBN 0-7136-3999-7
