Terns

species: 
Common Tern
scientific name: 
Sterna hirundo
notes: 

White ring with a black four alpha-numeric code, starting letter "A" or "E".

note 1 :  

website sighting submit: 
European colour ring Birding submit
email sighting submit: 
contactperson: 
Derick Hiemstra
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
First letter/number (of the c-ring): 
A or E