Spot-billed Ducks, from Asia, have three subspecies: the Indian, Chinese and Burmese. The Indian Spotbill (A. poecilorhyncha poecilorhyncha), above and immediately below, has lighter plumage and small red spots at the top base of bill (larger for males; inconspicuous for females); it also has a green speculum.

Both have bright orange legs.

The Chinese Spotbill is darker than the Indian, has no red spots at the base of the bill and has a blue speculum. Male and female have similar plumage.

The Pacific Black Duck (shown on separate page) has a similar face and plumage but a plain black bill, green speculum and much lighter yellow legs.