The fulvous whistling duck or fulvous tree duck (Dendrocygna bicolor) name comes from the hoarse whistling sound it makes and from its colouring – fulvous means tawny. Both sexes have a rufous-brown crown and upper nape, which becomes blackish down the centre of the hind neck. The sides of the head, neck, chest and belly are a rich rufous-buff, with the sides of the neck paler, almost whitish, with fine dark striations. They are vociferous both in flight and when feeding, uttering a two-note squealing whistle, "k-weeoo," and during disputes a harsh "kee." The fulvous whistling-duck can be found in marshlands, wet meadows, rice fields, flooded agricultural areas and lagoons in the southern United States as well as Central and South America, Africa and Asia.