The Whooper Swan (pronounced hooper) is similar in appearance to the Bewick's Swan. However, it is larger, at a length of 140–165 cm (55–65 in) and a wingspan of 205–275 cm (81–108 in). Weight typically is in the range of 7.4–14 kg (16–31 lb), with an average of 9.8–11.4 kg (22–25 lb) for males and 8.2–9.2 kg (18–20 lb) for females. The verified record mass was 15.5 kg (34 lb) for a wintering male from Denmark. It is considered to be amongst the heaviest flying birds.

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