The mute swan has a long S shaped thin neck, and an orange bill with black at its base (unkike the Whooper which has a yellow bill)
Males are usulaly larger and have a larger knob on their bill. The mute swan is one of the heaviest flying birds seen in the UK. Young birds, called cygnets, are not the bright white of mature adults, and their bill is dull greyish-black, not orange, for the first year. The down may range from pure white to grey to buff, with grey/buff the most common.
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