Mute Swan
Cygnus olor

The most common swan in Britain by far, they are often approachable, although can be aggressive (see the fifth picture). If feeding bread to swans, you should be careful to throw the bread into the water as eating dry bread can make them ill as it expands in their stomachs. These are adults:
 

Mute Swan  Mute Swan

Mute Swan  Mute Swan

Mute Swan

The next four are an adult and three first-winter birds.
 

Mute Swan  Mute Swan

Mute Swan  Mute Swan

Next is a juvenile and family with a brood of cygnets.
 

Mute Swan  Mute Swan

And some more cygnets.
 

Mute Swan  Mute Swan

1: Exeter, 24/04/2006.
2: Sandhurst Balancing Pond, 12/03/2007.
3-4: Radipole Lake RSPB, 23/01/2007.
5: Sandhurst Balancing Pond, 12/03/2007.
6-7: Sandhurst Balancing Pond, 04/02/2007.
8-9: Sandhurst Balancing Pond, 20/01/2006.
10: River Blackwater, Sandhurst, 27/06/2006.
11-13: Radipole Lake RSPB, 16/06/2006.