Gulls

species: 
Black-headed Gull
scientific name: 
Chroicocephalus ridibundus
notes: 

White ring with a black four alpha-numeric code, starting letter 'C'.

note 1 : up to 2014, a total of 2562 rings were delivered since 1998-2000.

note 2 :

website sighting submit: 
Report form for Finnish ring recoveries.
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: 
Finland.
First letter/number (of the c-ring): 
C