Terns

species: 
Common Tern
scientific name: 
Sterna hirundo
notes: 

White flag with a black three alpha-numeeic code.

note 1 :

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: 
The Netherlands.