Gulls

species: 
Great Black-backed Gull
scientific name: 
Larus marinus
notes: 

Dark-green ring with a white four alpha-numeric code, starting letter "C:" followed by a colon ":"

note 1 : used codes are : C:1A ~~ C:0A, C:1B ~~ C:0Z. Later change the letter position (C:A1 ~~ C:Z0).

note 2 :

email sighting submit: 
contactperson: 
Chris Redfern
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Dark Green [G]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
United Kingdom.
First letter/number (of the c-ring): 
C: