Swans

species: 
Whooper Swan
scientific name: 
Cygnus cygnus
notes: 

Yellow neckband with a black four alpha-numeric code.

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

email sighting submit: 
colour-ring type: 
Neckband.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Denmark.