A chocolate-brown duck with unmarked underparts, a pale-pink-and-black bill, orange legs, and white spots on the back and rump. A secretive and uncommon resident, preferring well-wooded, fast-flowing rivers but also visiting ponds. It forages mainly at dawn and dusk, dabbling for insects and plant matter. Differentiated from the similar Yellow-billed Duck by darker coloration, shorter neck, and dark, not vivid yellow, bill.