Gulls

species: 
Black-headed Gull
scientific name: 
Chroicocephalus ridibundus
notes: 

White ring with a black four alpha-numeric code.

note 1 : starting letter "J" followed by a three alpha-numeric code.

note 2 : 

website sighting submit: 
Colour Ringing Norway
email sighting submit: 
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: 
Norway.
First letter/number (of the c-ring): 
J