Swans

species: 
Mute Swan
scientific name: 
Cygnus olor
notes: 

White legring with a black four alpha-numeric code (letter/number/number/number) and metal ring (on the other leg).

note 1 : used codes are :  Y000-Y999

note 2 : birds are ringed in Utrecht, The Netherlands

note 3: this study looks into the survival and behaviour of mute swans in a mixed population with both "real wild" bird and birds that used to belong to "zwanendrifters" that can't fly.

note 4 :

email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
The Netherlands.
First letter/number (of the c-ring): 
Y