The fulvous whistling duck or fulvous tree duck (Dendrocygna bicolor) is a whistling duck that breeds across the world's tropical regions in much of Mexico and South America, the West Indies, the southern US, sub-Saharan Africa and the Indian subcontinent. It has mainly reddish brown plumage, long legs and a long grey bill, and shows a distinctive white band across its black tail in flight. Like other members of its ancient lineage, it has a whistling call which is given in flight or on the ground.