Egrets

species: 
Great Bittern
scientific name: 
Botaurus stellaris
notes: 

Yellow ring with a black three alpha-numeric code : letter/number/number.

note 1 :

website sighting submit: 
Ornithological Station, Museum and Institute of Zoology of the Polish Academy of Sciences.
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Three alpha-numeric code (3 letters/numbers).
countries where ringed: 
Poland.