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Mute swan, Cygnus olor, Mute swans are one of Britain's largest and heaviest birds. Life span, 10-20 years. Statistics, Length:140-160cm, Wingspan: 200-240cm, Weight: can be as heavy as 15kg. Physical Description, Mute swans are very large white birds, with a long, elegant neck. The bill is orange or pinkish in colour with black on the lower part and around the nostrils. Between the eyes and the bill is an area of featherless black skin that forms a hump over the bill - this is bigger in males. Young, known as cygnets, have grey feathers and a pale bill. They lack the hump on their bills.