Gulls

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

Red ring with a white four alpha-numeric code, starting OR ending letter "G" (Gipuzkoa).

note 1 :

website sighting submit: 
Aranzadi Portal for special marks in birds.
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Red [R]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Spain.