Crows

species: 
Rook
scientific name: 
Corvus frugilegus
notes: 

White ring with a black four alpha-numeric code (starting letter 'P followed by three numbers) (on one leg) and metal ring (on other leg).

note 1 :  

website sighting submit: 
Ornithological Station, Museum and Institute of Zoology of the Polish Academy of Sciences.
email sighting submit: 
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).
countries where ringed: 
Poland.
First letter/number (of the c-ring): 
P