Gulls

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

Black ring with a white four-alpha numeric code : nxxn, where n is a number and x a letter.

note 1 : birds ringed on Guernsey.

note 2 : 

website sighting submit: 
Bailiwick of Guernsey colour-ringed Gulls
email sighting submit: 
website information: 
Guersney Gulls website
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Black (Niger) [N]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Guernsey.