Terns

species: 
Sandwich Tern
scientific name: 
Thalasseus sandvicensis
notes: 

White ring  with a black four alpha code, starting letter "P".

note 1 : 

website sighting submit: 
Ornithological Station MIZ PAS
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Four alpha code (4 letters).
countries where ringed: 
Poland.
Images: 
First letter/number (of the c-ring): 
P