Gulls

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

White ring with a black four alpha-numeric code, starting letter 'Y' followed by ' : ' and three numbers.

note 1 : used codes are Y:001 - Y:999.

email sighting submit: 
email sighting submit (2): 
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).
colour-ring position (of the c-ring): 
Tarsus right.
countries where ringed: 
Serbia.
First letter/number (of the c-ring): 
Y