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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.
Juveniles have downy grey-brown feathers with a pink and black tipped beak. Adult whooper swans are large birds, with an average length of 1.4 to 1.65 m and a wingspan of 2.05 to 2.75 m. Male weights range from 7.4 to 14 kg with an average of 9.8 kg, which is much heavier than the female weight range of 8.2 to 9.2 kg.