Gulls

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

Orange ring with a black four alpha code, with as second letter "B".

note 1 : the project runs in Bizkaia, Spain.

note 2 :

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