Gulls

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

Yellow ring with a black three alpha-numeric code :
number / number / ":" (colon) / letter "W"
OR
letter / number / ":" colon / letter "W"

note 1 : letter "W" is the scheme marker.

note 2 : used codes are : 1A:W, 1B:W ... 0Y:W, 0Z:W ... A1:W, A2:W ... Z9:W, Z0:W.

note 3 : c-ring on left tarsus and metal ring on right tarsus.

note 4 : also Herring Gull and Lesser Black-backed gull is ringed. 

note 5 :  birds ringed in Walney Island, Cumbria (93 LBbG and 65 HG), Copeland, Ireland (1 LBbG and 15 HG), Bowland, Lancashire (24 LBbG and 1 HG), Skokholm, Pembrokeshire (72 LBbG and 2 HG).

note 6 :

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): 
Three alpha-numeric code (3 letters/numbers).
colour-ring position (of the c-ring): 
Tibia left.
countries where ringed: 
United Kingdom.
Last letter (of the c-ring): 
:W