Gulls

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

Black ring with a white two alpha-numeric code (on left tarsus).

note 1 : between the code is a "-".

note 2 : 

website sighting submit: 
European colour-ring Birding submit : Black-headed Gull
email sighting submit: 
website information: 
Frank Majoor's website.
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Black (Niger) [N]
colour-ring code (of the c-ring): 
Two alpha-numeric code (2 letters/numbers).
colour-ring position (of the c-ring): 
Tarsus left.
countries where ringed: 
The Netherlands.