The Knob-billed Duck is a large species of duck found in tropical freshwater wetlands across parts of South America, Africa, and Asia. They are named for the large bill protrusion found in males. Across South America, the species is known as the Comb Duck.
Knob-billed Ducks eat by dabbling vegetation in water or on land. They may also eat small invertebrates.
While the population trend for the Knob-billed Duck is decreasing, the species is of conservation Least Concern due to its very large range. It is threatened by hunting, habitat loss, and environmental toxins.
