Gulls

species: 
Black-headed Gull
scientific name: 
Chroicocephalus ridibundus
notes: 

Yellow ring with a black four alpha-numeric code : first letter 'U' followed by three alpha-numeric or numeric code.  

note 1 :  used codes are U000 to U999.  

note 2 : during 2013-2018 used near 900 color rings.       

note 3 : birds ringed in different regions of Ukraine.  

note 4 : used code are in 2020-21 : UA00-UA99 ; UC00-UC99, than UE00-UE99 and later  UJ00-UJ99 etc.   

note 5 :

email sighting submit: 
email sighting submit (2): 
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: 
Ukraine.
First letter/number (of the c-ring): 
U