Terns

species: 
Sandwich Tern
scientific name: 
Thalasseus sandvicensis
notes: 

Yellow flag with a black five alpha-numeric code, starting letter "J", followed by number "0" and three numerics.

note 1 : vertical code on the front of the flag (see picture 2 and 3).

note 2 : there is a chance to mistake this with regular plastic ring (see picture 1).

note 3 :

website sighting submit: 
Polish Ringing Centre
email sighting submit: 
contactperson: 
Waterbirds Research Group Kuling
colour-ring type: 
Flag : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Five alpha-numeric code (5 letters/numbers).
countries where ringed: 
Poland.
Images: 
First letter/number (of the c-ring): 
J