Storks

species: 
Black Stork
scientific name: 
Ciconia nigra
notes: 

White ring with a black four alpha-numeric code, starting letter 'X'.

note 1 : 

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: 
Serbia.
First letter/number (of the c-ring): 
X