Terns

species: 
Common Tern
scientific name: 
Sterna hirundo
notes: 

Dark-blue ring with a white three alpha-numeric code, starting letter "Z" (on one leg) and metal ring (on other leg).

note 1 : used codes is : letter "Z" / letter / number.

note 2 : 

email sighting submit: 
email sighting submit (2): 
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: 
Serbia.
First letter/number (of the c-ring): 
Z