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They are large ducks, with the males about 76 cm (30 in) long, and weighing up to 7 kg (15 lb). Females are considerably smaller, and only grow to 3 kg (6.6 lb), roughly half the males' size.
A scientist studies a species of duck. The males and females are about the same size. The females are brown, and the males are a bright mix of blue, white, and green.