Gulls

species: 
Lesser Black-backed Gull
scientific name: 
Larus fuscus
notes: 

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

note 1 : used codes are :

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: 
United Kingdom.
Last letter (of the c-ring): 
:W