Terns

species: 
Caspian Tern
scientific name: 
Hydroprogne caspia
notes: 

Dark-blue ring with a white three alpha-numeric (letter/number/number or letter/number/letter where "S" is the first letter.

note 1 :  blue ring with code on one tarsus, metal on other.

note 2 : up to 2013 16 birds have been ringed

note 3 : birds are ringed at Ume River Delta, Sweden (63º45´N 20º18´E)

note 4 :

email sighting submit: 
email sighting submit (2): 
email sighting submit (3): 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Dark Blue [B]
colour-ring code (of the c-ring): 
Three alpha-numeric code (3 letters/numbers).
countries where ringed: 
Sweden.
Images: 
First letter/number (of the c-ring): 
S