Swans

species: 
Whooper Swan
scientific name: 
Cygnus cygnus
EURING code: 
01540
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

Images: 
email sighting submit: 
snailmail sighting submit: 
Wildfowl & Wetland Trust, Research Dept., Slimbridge, Gloucester GL2 7BT, United Kingdom.
colour-ring type: 
Legring : one, coded.
colour-ring colour: 
Yellow [Y]
colour-ring code: 
Three alpha-numeric code (3 letters/numbers).
countries where ringed: 
United Kingdom.