Terns

species: 
Whiskered Tern
scientific name: 
Chlidonias hybrida
notes: 

White flag with a black three alpha-numeric code.

note 1 :

website sighting submit: 
Ornithological Station, Museum and Institute of Zoology of the Polish Academy of Sciences.
email sighting submit: 
colour-ring type: 
Flag : one, coded.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Three alpha-numeric code (3 letters/numbers).
countries where ringed: 
Poland.