Swans

species: 
Whooper Swan
scientific name: 
Cygnus cygnus
notes: 

Blue neckband with a white four alpha-numeric code (number / letter / number / number).

note 1 : used codes are 1C00-1C99, 2C00-2C99, 3C00-3C99, 4C00-4C99, 5C00-5C99,6C00-6C99, 8C00-8C99, 9C00-9C99, 0E00-0E99, 1E00-1E99, 2U21, 2U22, 2U50-2U52, 2U54-2U59, 2E00-2E99, 3E00-3E99, 4E00-4E99, 5E00-5E99,  6E00-6E99 7E00-7E99 8E00-8E99 9E00-9E99 ... or also number / letter' Y'/ number / number.

note 2 : neck collars CT30 and CT39 are used on Whoopers.

note 3 : recent used codes : 0Y00-0Y99, 1Y00-1Y99, 2Y00-2Y99, 3Y00-3Y99, 4Y00-4Y99.

note 4 :

colour-ring type: 
Neckband.
colour-ring colour (of the c-ring): 
Dark Blue [B]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Latvia.