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The swans are the largest members of the duck family Anatidae,
and are amongst the largest flying birds. The largest species,
including the mute swan, trumpeter swan, and whooper swan,
can reach length of over 1.5 meters and weigh over 15 kg.
Their wingspans can be almost 3 meters. Compared to the closely
related geese they are much larger in size and have proportionally
larger feet and necks. They also have a patch of unfeathered
skin between the eyes and bill in adults. The sexes are alike
in plumage, but males are generally bigger and heavier than
females.
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