Whooper Swan

White ring with a black three alpha code.

note 1 :

White ring with a black three alphanumeric code. 

note 1 :

White neckband with a black 4 alpha-numeric code : number/number/number/ letter 'X'.

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White rings with a black two alpha code.

note 1 : 

Blue neckband with a white four alpha-numeric code :
number/letter 'P'/number/number).

note 1 : 

Red neckband with a white three alpha-numeric code, starting letter 'B' followed by two numbers.

note 1 :

Red ring with a white three alpha-numeric code, starting letter 'B' followed by two numbers. 

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Orange ring with a black three alpha code. 

note 1 : birds ringed at the WWT-centres and on the breeding grounds in Iceland.

note 2 : females are ringed on left leg and males on right leg.

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

Yellow neckband with a black four alpha-numeric code.

note 1 : used codes are 2J00-2J99 and 3J00-3J99.