Mute Swan(Cygnus olor) is a common Eurasian member of the duck, goose and swan family Anatidae.

Distribution
This bird is found naturally mainly in temperate areas of Europe and western Asia. It is not migratory, although some populations must move in winter when waterways and lakes freeze. They are sometimes found at the coast, particularly in winter, rather than solely being birds of inland waters.

For aesthetic reasons, this species is often kept in captivity, in areas where it is not native, in order to decorate parks and ponds. The descendants of such birds have become naturalised in the eastern United States and Great Lakes, much as the Canada Goose has done in Europe. In some locations, such as Chesapeake Bay, the numbers of these feral birds have increased to the point where they are considered pests because they compete with native birds for habitat and food.

Adults of this large swan range from 125-155 cm long with a 200-240 cm wingspan. They may stand over 1.2 m (four feet) tall. Males are larger than females and have a larger knob on their bill. The Mute Swan is one of the heaviest flying birds, with males weighing more than 12kg (27 lb), and females more than 11 kg (25 lb).

Its size, orange-reddish bill and white plumage make this swan almost unmistakable. The most similar species is Whooper Swan, but that has a yellow and black bill, and lacks the curved "swan" neck, is longer and heavier and lacks the characteristic projection above the bill.


Young birds, called "cygnets", are not the bright white of mature adults, and lack the bright orange bill. The color of the down may be a dull white or gray, and controversy exists over whether the color is related to their gender.


Behaviour
Mute Swans nest on large mounds that they build in the middle of a shallow lake. These monogamous birds reuse the same nest each year, restoring or rebuilding it as needed. Male and female swans share the care of the nest, and once the cygnets are fledged it is not uncommon to see whole families looking for food. They feed on submerged aquatic vegetation, reached with their long bills.

Although this bird can be tame, especially to those who feed it daily, it is aggressive in defence of its nest, and its size and impressive hissing make it a formidable adversary for animals as large as a fox; a grunt, on the other hand, may be a positive signal. There have been many reports of Mute Swans attacking people who enter their territory.

However, the Mute Swan is less vocal than the noisy Whooper and Bewick's Swans; the most familiar sound associated with Mute Swan is the whooshing of the wings in flight once this bird has laboriously taken off from the water. The phrase Swan song refers to this swan and to the completely false, famous, ancient legend that it is utterly silent until the last moment of its life, and sings one achingly beautiful song just before dying.

Unlike Black Swans, Mute Swans are strongly territorial. The familiar pose with neck curved back and wings half raised, known as busking, is a threat display.

The Mute Swan is protected in most of its range, but this has not prevented illegal hunting and poaching.

Trivia

The Mute Swan is the national bird of the Kingdom of Denmark.

All Mute Swans in the UK (with the possible exception of those in Orkney and Shetland) are considered the property of the British monarch, except for flocks owned by the Vintners' and Dyers' Companies. See Swan Upping (below)

The Mute Swans in the moat at The Bishops Palace at Wells Cathedral in Wells, England have for centuries been trained to ring bells via strings attached to them to beg for food. Two Swans are still able to ring for lunch.

There is rich iconographic and literary evidence for Celtic bird-goddesses who took the form of swans. Similarly, swans are highly revered in Hinduism. The Roman Julius Caesar noted that the British tribes thought wild geese and swans "unlawful" to eat or kill. By medieval times, though, swans were considered an edible form of poultry. Nowadays they are a protected species in many countries.
The noise a swan makes was uniquely known as a beable, but this word has fallen into disuse in all but a few parts of Britain. Both the Ancient Britons and the Anglo-Saxons believed that a swan's wings throbbed and sang with a human voice when they flew.

Swan Upping
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Swan Upping is an annual ceremonial and practical activity in England in which mute swans on the River Thames are rounded up, caught, marked, and then released.

Traditionally, the Monarch of the United Kingdom owns all unmarked mute swans on the River Thames. This dates from the 12th century, during which swans were a common food source for royalty. Swan upping is a means of establishing a swan census. Under a Royal Charter of the 15th century, the Vintners' Company and the Dyers' Company, two Livery Companies of the City of London, are entitled to share in the Sovereign's ownership. They conduct the census through a process of ringing the swan's feet, but the swans are no longer eaten.

Swan upping occurs annually during the third week of July. During the ceremony, the Queen's, the Vintners', and the Dyers' Swan Uppers row up the river in skiffs. Swans caught by the Queen's Swan Uppers under the direction of the Swan Marker remain unmarked, those caught by the Dyers' are ringed on one leg, and those caught by the Vintners are ringed on both legs. Originally, rather than being ringed, the swans would be marked on the bill — a practice commemorated in the pub name The Swan with Two Necks, a corruption of the term "The Swan with Two Nicks".