Mute Swan
Cygnus olor

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.
 

Mute Swan

Mute Swan

Mute Swan

1: Canal de la Broye, La Sauge, 28/04/2007.
2: Biel/Bienne, 13/04/2008.
3: Zihlbrücke, Gampelen, 29/12/2007.