The White-faced Whistling Duck (Dendrocygna viduata) is a large duck, 18" (45cm) and the male & female are similar, while the young are duller. It is a gregarious bird, except when breeding and is found in flocks numbering hundreds, feeding in open freshwater or resting on the shore. It also flies and feeds at night, on seeds and plant matter.
The White-faced Whistling Duck has a sibilant, three note whistling call "swee-swee-sweeu". Found throughout sub-Saharian Africa and South America, it is presumed that human intervention assisted its trans-continental spread.