Swans

species: 
Whooper Swan
scientific name: 
Cygnus cygnus
notes: 

Yellow ring with a black three alpha-numeric code.

note 1 : code can be a wide variety of number-letter combinations:

numeric/alpha/alpha 3AA-9ZZ.
alpha/alpha/numeric FA3-ZZ9.
numeric/numeric/alpha 31A-99Z.
alpha/numeric/numeric A33-Z99.
alpha/numeric/alpha A3A-Y9Z.

note 2: code can also be just letters, with no numbers, detailed here : http://www.cr-birding.org/node/1367

email sighting submit: 
website information: 
Summary of WWT ringing schemes.
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Three alpha-numeric code (3 letters/numbers).
countries where ringed: 
United Kingdom.
Images: