Gulls

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

Yellow ring with a black four alpha-numeric code , starting letter "B" followed by a colon ":" and three numbers.

note 1 :

email sighting submit: 
colour-ring type: 
Legring : one, coded.
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: 
Ireland.
First letter/number (of the c-ring): 
B: