Colorful miniature goose that is smaller than most ducks. Both sexes have rufous underparts, a dark back, white on the face, and white on the wing in flight. Males have a green patch on the back of the head and a yellow bill; females have a black-and-white head and a dark bill. Found in freshwater wetlands with floating vegetation, especially water lilies. Shy and inconspicuous, as it generally avoids open water. Voice is a high-pitched squeaking. Small size and bold and colorful plumage separate it from other waterfowl.