• Source: White-faced whistling duck

The white-faced whistling duck (Dendrocygna viduata) is a whistling duck that breeds in sub-Saharan Africa and much of South America.
This species is gregarious, and at favoured sites, the flocks of a thousand or more birds arriving at dawn are an impressive sight. As the name implies, these are noisy birds with a clear three-note whistling call.




Taxonomy


The white-faced whistling duck was formally described by the Swedish naturalist Carl Linnaeus in 1766 in the twelfth edition of his Systema Naturae under the binomial name Anas viduata. He specified the type locality as Cartagena in Colombia. The white-faced whistling duck is now one of eight species placed in the genus Dendrocygna that was introduced in 1837 by the English naturalist William Swainson. The species is considered as monotypic: no subspecies are recognised. The genus name combines the Ancient Greek dendron meaning "tree" with the genus name Cygnus Bechstein, 1803, meaning "swan" in Latin. The specific epithet viduata is Latin meaning "widowed" or "in mourning".




Description


The white-faced whistling duck has a long grey bill, a long head, and longish legs. It has a black neck and head, and a distinctive white face that gives it its name, though the amount of white color visible has regional variations among the species. For example, the white-faced whistling ducks with more black coloration are commonly found in western Africa where rainfall supersedes the dry season. The back and wings are dark brown to black, and the underparts are black with a fine white barring on the flanks. The neck is chestnut. Males and females have similar plumage. Juveniles are similar in color to adults but have a much less contrasted head pattern.




Distribution and habitat


The white-faced whistling duck has a peculiar disjunctive distribution, occurring in Africa and South America. It has been suggested that they may have been transported to new locations worldwide by humans. The habitat is still freshwater lakes or reservoirs, with plentiful vegetation, where this duck feeds on seeds and other plant food.
Because of its large range, there are many common names for the white-faced whistling duck, including "irere" and "guiriri".




Behaviour and ecology


This is an abundant species. It is largely resident, apart from local movements which can be 100 km or more.




= Breeding

=
The nest site is a depression in the ground or in reed beds. The clutch is 6 to 12 eggs which are incubated by both sexes. The eggs hatch after 26 to 28 days. Both sexes attend the ducklings and usually keep them hidden in reeds. The chicks have dark down above and yellow down below. They fledge after two months.




Conservation


The white-faced whistling duck is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.




Gallery



























References



Wildfowl by Madge and Burn, ISBN 0-7470-2201-1




Further reading


Species text in The Atlas of Southern African Birds.
Treca, B., 1981: Diet of the white-faced Tree Duck (Dendrocygna viduata) in the Senegal delta. Oiseau et la Revue Francaise d’ Ornithologie 51(3): 219-238
Petrie, Scott A.; Rogers, Kevin H. (1997). "Activity budget of breeding white-faced whistling ducks Dendrocygna viduata on stock-ponds in semi-arid South Africa, and a comparison with north-temperate waterfowl". South African Journal of Wildlife Research. 27 (3): 79–85. hdl:10520/EJC117039.
Menegueti, J. O., Burger, M. I., Frozi, M., Tavares, A. E., Dotto, J. C., Fontana, C. S., Ramos, R. A. & Setubal, S. S. (1988) Nota prévia sobre os comportamentos reprodutivos de Dendrocygna viduata e Dendrocygna autumnalis no norte e noroeste do Estado de São Paulo. Resumos: XV Congresso Brasileiro de Zoologia. 31/1 a 5/2/1998. p. 468. Curitiba: Universidade Federal do Paraná.
Petrie, Scott A. (2005). "Spring body condition, moult status, diet and behaviour of white-faced whistling ducks (Dendrocygna viduata) in northern South Africa". African Zoology. 40 (1): 83–92. doi:10.1080/15627020.2005.11407313. S2CID 56074972.
Gauthier-Clerc, Michel; Tamisier, Alain; Cezilly, Frank (1994). "Sleeping and vigilance in the white-faced whistling-duck". The Wilson Bulletin. 106 (4): 759–762. JSTOR 4163495.
Cooke, Richard G.; Olson, Storrs L. (1984). "An archaeological record for the white-faced whistling-duck Dendrocygna viduata in Central Panama" (PDF). The Condor. 86 (4): 493–494. doi:10.2307/1366841. hdl:10088/6469. JSTOR 1366841.
Volodin, Ilya A.; Volodina, Elena V.; Klenova, Anna V.; Filatova, Olga A. (2005). "Individual and sexual differences in the calls of the monomorphic white-faced whistling duck Dendrocygna viduata". Acta Ornithologica. 40 (1): 43–52. doi:10.3161/068.040.0110. S2CID 13828888.
Friedmann, Herbert (1947). "Geographic variations of the black-bellied, fulvous, and white-faced tree-ducks" (PDF). The Condor. 49 (5): 189–195. doi:10.2307/1364339. JSTOR 1364339.
Alexander, S. J.; McLaughlin, J. D. (1997). "A checklist of helminths from the respiratory system and gastrointestinal tracts of African Anatidae". Onderstepoort Journal of Veterinary Research. 64 (1): 5–16. hdl:2263/20711. PMID 9204498.

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