Gulls

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

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

note 1 : between the code is a "-".

note 2 :  

email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Black (Niger) [N]
colour-ring code (of the c-ring): 
Two numeric code (2 numbers).
colour-ring position (of the c-ring): 
Tarsus left.
countries where ringed: 
The Netherlands.