The White-faced Whistling duck (Dendrocygna viduata) is found in freshwater marshes from Costa Rica to northern Argentina and Uruguay. With a black head and crown and white cheek and forehead, the White-faced Whistling-Duck easily is distinguishable from other species in the genus Dendrocygna. These birds are mainly night foragers and feed on a variety of food items including grass, seeds, and aquatic mollusks.