Gulls

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

White ring with a black four alpha-numeric code :
* starting letter 'N' followed by a colon ":"
- followed by three numbers or three alpha-numerics. 
or
- followed by letter 'A' / number (4 or 5) / letter. 

note 1 : ex. : N:001-N:999 ; N:A4A ; N:A5X but also N:37X, ...

note 2 : 

email sighting submit: 
email sighting submit (2): 
email sighting submit (3): 
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).
countries where ringed: 
Spain.
First letter/number (of the c-ring): 
N: