These are the largest European swans and also the only ones you are likely to find outside of Scandanavia during the Summer. Although not really mute, they are much quieter than Whooper or Bewick's swans.
1: Canal de la Broye, La Sauge, 28/04/2007.
2: Biel/Bienne, 13/04/2008.
3: Zihlbrücke, Gampelen, 29/12/2007.