Gulls

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

Yellow ring with a black four alpha-numeric code, starting letter "K". 

note 1 : used codes are K000-K999, KA00-KZ99 and K00A-K99A, K00C-K99C, K00E-K99E.

note 2 : 

email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Latvia.
First letter/number (of the c-ring): 
K