Terns

species: 
Black Tern
scientific name: 
Chlidonias niger
notes: 

Blue ring with a white two numeric code (on left leg) and metal ring (on right leg).

note 1 :

website sighting submit: 
Report form for Finnish ring recoveries
email sighting submit: 
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).