Gulls

species: 
Caspian Gull
scientific name: 
Larus cachinnans
notes: 

Blue ring with a white 2 alpha numeric code with or without a bar between alpha. (mainly on right tibia).

note 1 :

email sighting submit: 
website information: 
Gull Research
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Dark Blue [B]
colour-ring code (of the c-ring): 
Two numeric code (2 numbers).
colour-ring position (of the c-ring): 
Tibia right.
countries where ringed: 
The Netherlands.