Crows

species: 
Rook
scientific name: 
Corvus frugilegus
notes: 

Yellow ring with a four alpha code, starting letter "W".

note 1 :

email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Czech Republic.
First letter/number (of the c-ring): 
W